The ARIES Group, LLC

The ARIES Group, LLC offers:

• Continuing Education Courses, Field and Classroom
• Predictive models for exploration and field development
• Integration of wireline log, core and outcrop data
• Detailed stratigraphic and sedimentologic analysis of clastic reservoir facies
• Reconstruction of clastic depositional paleoenvironments

Dr. Thomas A. Ryer is a stratigrapher and sedimentologist who specializes in the development of depositional models for energy exploration and development.  He holds degrees from Johns Hopkins (B.A., 1970) and Yale Universities (Ph.D., 1975) and is an expert on cyclic sedimentation and the relationships between sedimentary cycles and paleotectonics, particularly within foreland basin settings.  Tom is an authority on the Cretaceous System of the Western Interior and is widely recognized for his research on the sedimentology and facies relationships of shallow-marine to fluvial clastics.

While a Project Manager with the U.S. Geological Survey, Tom conducted research into the relationships between transgressive-regressive cycles, paleoenvironments of deposition, and the distributions of coal beds in Cretaceous strata of the Rocky Mountain region.

As Senior Geologist of RPI International and President of RPI's Boulder, Colorado office, Tom was involved with detailed stratigraphic analysis, mapping and depositional modeling of sandstone petroleum reservoirs.  He has conducted comprehensive studies of the stratigraphy, depositional history and petroleum potential of numerous Cretaceous formations in southern Alberta and the Rocky Mountain region of the U.S.

While a Senior Staff Geologist with Apache International in Denver, Tom gained familiarity with the petroleum geology of a large number of basins throughout the world.  In additional to evaluating numerous exploration opportunities for Apache, he conducted broader studies of the stratigraphy and oil and gas potential of the Neuquen and Northwest basins of Argentina and of several basins in Romania. 

At Schlumberger, Tom worked on a variety of projects worldwide as an Advisor in Geology.  His focus was on integrating sedimentologic and stratigraphic studies into the building of geological models for reservoir simulation.  In addition to projects in North America, Tom worked on projects in Republic of Georgia, Bolivia, China, Indonesia and Russia.

At Occidental Oil and Gas Company, Houson, Tom was a member of the expert group and advised and number of OXY reservoir characterization projects worldwide.

Through The ARIES Group, LLC, Tom has participated in a variety of oil and gas related research and development projects both at home and abroad, among them exploration, development, and appraisal projects in Argentina, Romania, Venezuela, Bolivia and Ecuador.  He was actively involved in teaching clastics courses, both in the classroom and the field.

Tom is a field seminar instructor in the American Association of Petroleum Geologists Continuing Education Program, has been an AAPG Distinguished Lecturer, and is a two-time winner of AAPG's A.I. Levorsen "Best Paper" award.  He is the author of 40 publications, 60 published abstracts, and numerous proprietary reports.

1. Ryer, T. A., 1976, Cretaceous invertebrate faunal assemblages of the Frontier and Aspen Formations, Coalville and Rockport areas, north-central Utah:The Mountain Geologist, v. 13, no. 3, p. 101-114.
2. Ryer, T. A., 1976, Cretaceous stratigraphy of the Coalville and Rockport areas, Utah:Utah Geology, v. 3, no. 2, p. 71-83.
3. Ryer, T. A., 1977, Age of Frontier Formation in north-central Utah:Amer. Assoc. Petroleum Geol. Bull., v. 61, no. 1, p. 112-116.
4. Ryer, T. A., 1977, Patterns of Cretaceous shallow-marine sedimentation, Coalville and Rockport areas, Utah:Geol. Soc. America Bull., v. 88, no. 2, p. 177-188.
5. Ryer, T. A., 1977, Geology and coal resources of the Foidel Creek EMRIA site and surrounding area, Routt County, Colorado:U.S. Geol. Survey Open-file report 77-303, 31 p., 6 figs., 8 tables.
6. Ryer, T. A., 1977, Coalville and Rockport areas, Utah in Kauffman, E. G., ed., Cretaceous facies, faunas, and paleoenvironments across the Western Interior basin:The Mountain Geologist, v. 14, nos. 3 and 4, p. 105-128.
7. Hayes, P. T., Ryer, T. A., Kiteley, L. W., Hatch, J. R., Osterwald, F. W., Dunrud, C. R., and Connor, J. J., 1977, Summary of the geology, mineral resources, engineering geology characteristics, and environmental geochemistry of east-central Utah:U.S. Geol. Survey Open-file report 77-513, 136 p.
8. Klein, G. de V., and Ryer, T. A., 1978, Tidal circulation patterns in Precambrian, Paleozoic, and Cretaceous epeiric and mioclinal shelf seas:Geol. Soc. America Bull.,v. 89, p. 1050-1058.
9. Affolter, R. H., Hatch, J. R., and Ryer, T. A., 1979, Chemical analyses of coal and shale from the Ferron Sandstone Member of the Mancos Shale, Emery coal field, Emery County, Utah:U.S. Geol. Survey Open-file report 79-858, 35p.
10. Ryer, T. A., 1980, Deltaic coals of the Ferron Sandstone Member of the Mancos Shale--Predictive model for Cretaceous coals of the Western Interior in Carter, L. M., ed., Proceedings of the Fourth Symposium on the Geology of Rocky Mountain Coal:Colorado Geol. Survey, Resource Series no. 10, p.4-5.
11. Ryer, T. A., 1980, The Muddy and Quitchupah Projects--A progress report with descriptions of cores of the I, J, and C coal beds from the Emery coal field, central Utah:U.S. Geological Survey Open-file report 81-460, 34 p., 3 figs.
12. Ryer, T. A., and Langer, A. W., 1980, Thickness change involved in the peat-to-coal transformation for a bituminous coal of Cretaceous age in central Utah:Journal of Sedimentary Petrology, v. 50, no. 3, p. 987-992.
13. Ryer, T. A., Phillips, R. E., Bohor, B. F., and Pollastro, R. M., 1980, Use of altered volcanic ash falls in stratigraphic studies of coal-bearing sequences--An example from the Upper Cretaceous Ferron Sandstone Member in central Utah:Geol. Soc. Amer. Bull., part 1, v. 91, p. 579-586.
14. Ryer, T. A., 1980, The Muddy and Quitchupah Projects: A progress report with descriptions of cores of the I, J, and C coal beds from the Emery coal field, central Utah:U.S. Geological Survey Open-file report 81-460, 34 p., 3 figs.
15. Ryer, T. A., 1981, Deltaic coals of Ferron Sandstone Member of Mancos Shale--Predictive model for Cretaceous coal-bearing strata of Western Interior:Amer. Assoc. Petroleum Geol. Bull., v. 65, no. 11, p. 2323-2340.
16. Ryer, T. A., 1982, Rocky Mountain Coal Symposium Field Trip --first day road log--Ferron Sandstone Member in Gurgel, K. D., ed., Proceedings--Fifth Symposium on the Geology of Rocky Mountain Coal:Utah Geol. and Mineral Survey, Bull. 118, p. 274-282.
17. Ryer, T. A., 1982, Possible eustatic control on the location of Utah Cretaceous coal fields in Gurgel, K. D., ed., Proceedings--Fifth Symposium on the Geology of Rocky Mountain Coal:Utah Geol. and Mineral Survey, Bull. 118, p. 89-93.
18. Ryer, T. A., 1982, Cross section of the Ferron Sandstone Member of the Mancos Shale in the Emery coal field, Emery and Sevier Counties, central Utah:U.S. Geol. Survey Map MF-1357.
19. Ryer, T. A., Transgressive-regressive cycles and the occurrence of coal in some Upper Cretaceous strata of Utah:Geology, v. 11, p. 207-210.
20. Ryer, T. A., and McPhillips, M., 1983, Late Cretaceous paleo-geography of east-central Utah in Reynolds, M. W., and Dolly, E. D., eds., Mesozoic paleogeography of the west-central United States:Rocky Mountain Section Soc. Econ. Paleont. and Min., Rocky Mountain Paleogeography Symposium 2, p. 253-272.
21. Ryer, T. A., 1984, Transgressive-regressive cycles and the occurrence of coal in some Upper Cretaceous strata of Utah, U.S.A.:Special Pub. International Assoc. Sedimentologists No. 7, p. 217-227.
22. Ryer, T. A., and J. R. Lovekin, 1986, The Upper Cretaceous Vernal Delta of Utah--Depositional or paleotectonic feature? in J. Peterson, ed., Paleotectonics and sedimentation in the Rocky Mountain region, United States:Amer. Assoc. Petroleum Geol. Memoir 41, p. 497-510.
23. Ryer, T. A., J. J. McClurg and M. M. Muller, 1987, Dakota-Bear River paleoenvironments, depositional history, and shoreline trends--Implications for foreland basin paleotectonics, southwestern Green River Basin and southern Wyoming Overthrust Belt:Wyoming Geol. Assoc. 38th Annual Field Conf. Guidebook, p. 179-206.
24. Eaton, J. G., J. I. Kirkland, E. R. Gustason, J. D. Nations, K. J. Franczyk, T. A. Ryer, and D. A. Carr, 1987, Stratigraphy, correlation, and tectonic setting of Late Cretaceous rocks in the Kaiparowits and Black Mesa Basins in G. H. Davis and E. M. VanderDolder, eds. Geologic diversity of Arizona and its margins--Excursions to choice areas, Arizona Bureau of Geology and Mineral Technology, Geological Survey Branch Special Paper 5, p. 113-125.
25. Gustason, E. R., T. A. Ryer, and S. K. Odland, 1988, Stratigraphy and depositional environments of the Muddy Sandstone, northwestern Black Hills, Wyoming:Earth Science Bull., v. 20, p. 49-60.
26. Ryer, T. A., 1988, Cretaceous transgressive-regressive cycles and foreland basin tectonics in Utah:Louisville, CO, The Aries Group, Inc., 137p., 68 text figs.Revised versions produced in following years.
27. Gustason, E. R., T. A. Ryer, and J. Bauer, 1988, Muddy-Turner Field Trip, Day 1:Earth Science Bull., v. 20, p. 61-65.
28. Crowley, S. S., R. W. Stanton, and T. A. Ryer, 1989, The effects of volcanic ash falls on maceral and chemical composition in the C coal bed, Emery coal field, Utah:Organic Geochemistry, v. 14, no. 3, p. 315-346.
29. Ryer, T. A., 1990, Stratigraphic concepts and methods for exploration in clastic facies--A core workshop:Denver, Rocky Mountain Association of Geologists, 163p.
30. Ryer, T. A., 1991, Stratigraphy, facies, and depositional history of the Ferron Sandstone in the canyon of Muddy Creek, east-central Utah in T. C. Chidsey, Jr., ed., Geology of east-central Utah: Utah Geological Association Publication 19, p. 45-54.
31. Ryer, T. A., 1993, The Ferron Sandstone of central Utah--An overview in T. A. Ryer, E. R. Gustason, and P. B. Anderson, Stratigraphy and facies architecture of the Ferron Sandstone Member of the Mancos Shale:Utah Geological Survey/Rocky Mountain Section AAPG field trip guidebook, 9p.
32. Ryer, T. A., and E. R. Gustason, 1993, Indian Canyon and Willow Springs Wash:Parasequences--Basic building blocks of prograding shorelines in T. A. Ryer, E. R. Gustason, and P. B. Anderson, Stratigraphy and facies architecture of the Ferron Sandstone Member of the Mancos Shale:Utah Geological Survey/Rocky Mountain Section AAPG field trip guidebook, 19p.
33. Ryer, T. A., E. R. Gustason, and P. B. Anderson, 1993, Ferron delta-front units Nos. 1 and 2, southern part of Muddy Creek Canyon in T. A. Ryer, E. R. Gustason, and P. B. Anderson, Stratigraphy and facies architecture of the Ferron Sandstone Member of the Mancos Shale:Utah Geological Survey/Rocky Mountain Section AAPG field trip guidebook, 20p.
34. Gustason, E. R., T. A. Ryer, and P. B. Anderson, 1993, Integration of outcrop and subsurface information for geological model building in fluvial-deltaic reservoirs:Utah Geological Survey/Rocky Mountain Section AAPG Core Workshop Manual, Sept. 16, 24 p.
35. Ryer, T. A., 1993, Speculations on the origins of mid-Cretaceous clastic wedges, central Rocky Mountain region, United States in W. G. E. Caldwell and E. G. Kauffman, eds, Evolution of the Western Interior Basin:Geological Association of Canada Special Paper 39, p. 189-198.
36. Ryer, T. A., 1994, Interplay of tectonics, eustacy, and sedimentation in the formation of mid-Cretaceous clastic wedges, central and northern Rocky Mountain regions in J. C. Dolson, M. L. Hendricks, and W. A. Wescott, eds, Unconformity-related hydrocarbons in sedimentary sequences:Denver, CO, Rocky Mountain Assoc. Geologists, p. 35-44.
37. Ryer, T. A., 1996, Geology in Schlumberger GeoQuest, Emerging resources of the Greater Green River Basin:Gas Research Institute Report GRI-96/0096, CD ROM atlas.
38. Anderson, P. B., T. C. Chidsey, Jr., and T. A. Ryer, 1997, Fluvial-deltaic sedimentation and stratigraphy of the Ferron Sandstone:Guidebook, Brigham Young Univ. Geol. Studies v. 42, no. 2, p. 135-154.
39. Ryer, T. A., P. B. Anderson, T. C. Chidsey, Jr., C. B. Forster, and T. H. Morris, 1998, Stratigraphic framework for reservoir modeling in fluvial-deltaic deposits:A parasequence level analysis and reservoir characterization of the Ferron Sandstone, Utah:Guidebook for Field Trip 15, Annual Meeting of the American Assoc. Petroleum Geologists, Salt Lake City.
40. Ryer, T. A., P. B. Anderson, C. B. Forster, S. H. Snelgrove, and A. Mattson, 1998, Core and reservoir modeling workshop:Fluvial-deltaic nearshore sands of the Ferron Sandstone:Notes for Short Course 15, Annual Meeting of the American Assoc. Petroleum Geologists, Salt Lake City.
41. Van Mechelen, G., N. Comrie-Smith, J. Meyer, R. Gir, M. Bagge, T. Ryer, and R. Baggot, 2000, Field development planning in the South Natuna Sea:Schlumberger, Indonesia 2000:Reservoir Optimization Conference, p. 42-47.
42. Various chapters in Chidsey, T. C., Jr., compiler and editor, 2000, Geological and petrophysical characaterization of the Ferron Sandstone for 3-D simulation of a fluvial-deltaic resrvoir:Utah Geological Survey report prepared for U.S. Department of Energy, contract no. DE-AC22-93BC14896:
43. T. C. Chidsey, Jr., T. A. Ryer, and T. H. Morris, Chapter I - Introduction, 9p.
44. T. A. Ryer, D. E. Tabet, and T. C. Chidsey, Jr., Chapter II - Previous Studies, 47p.
45. T. A. Ryer and P. B. Anderson, Chapter III - Facies of the Ferron Sandstone, 31p.
46. T. A. Ryer, P. B. Anderson, T. C. Chidsey, Jr., and K. McClure, Chapter IV - Regional stratigraphy of the Ferron Sandstone, 37p.
47. T. H. Morris, J. A. Dewey, and T. A. Ryer, Chapter V - Geologic framework of Willow Springs Wash case-study area, 33p.
48. T. A. Ryer, Chapter VI - Geologic framework of the Muddy Creek Canyon case-study area
49. P. B. Anderson, T. C. Chidsey, Jr., T. A. Ryer, A. Mattson, and R. D. Adams, Chapter VII - Geologic framework of Ivie Creek case-study area, 71p.
50. Li, Haiping , H. Xiong, J. Wang, R. J. Broetz, H. Azoba, T. A. Ryer, G. D. Miller, T. Chism Rahn, N. A. Wiltgen, B.M. Robinson, R. L. Kugler, D. W. Lee, R.A. Plumb, R. Martin, J. Spivey,L. San, and W. Song, 2002, A Case Study: Field Development Plan for a Highly Overpressured Gas Reservoir in China by a Multidisciplinary Consulting Team:SPE Paper 77668, 11p, SPE Annual Technical Conference and Exhibition held in San Antonio, Texas, 29 September 2 October 2002.
51. Anderson, P. B., McClure, K., Chidsey, T. C., Jr., Ryer, T. A., Morris, T. H., Dewey, J. A., Jr., and Adams, R. D., 2003, Interpreted regional photomosaics and cross section, Cretaceous Ferron Sandstone, east-central Utah:Utah Geological Survey Open File Report 412, CD ROM, pdf format including 228 photomosaics, 43 measured sections, and 5 core descriptions.
52. Ryer, T. A., 2004, Previous studies of the Ferron Sandstone, in Chidsey, T. C., R. D. Adams and T. H. Morris, (eds.), Regional to wellbore analog for fluvial-deltaic reservoir modeling: The Ferron Sandstone of Utah, AAPG Studies in Geology 50, p. 3-38.
53. Ryer, T. A., and P. B. Anderson, 2004, Facies of the Ferron Sandstone, east-central Utah, in Chidsey, T. C., R. D. Adams and T. H. Morris, (eds.), Regional to wellbore analog for fluvial-deltaic reservoir modeling: The Ferron Sandstone of Utah, AAPG Studies in Geology 50, p. 59-78.
54. Anderson, P. B. and T. A. Ryer, 2004, Regional stratigraphy of the Ferron Sandstone, in Chidsey, T. C., R. D. Adams and T. H. Morris, (eds.), Regional to wellbore analog for fluvial-deltaic reservoir modeling: The Ferron Sandstone of Utah, AAPG Studies in Geology 50, p. 211-224.
55. Anderson, P. B., T. C. Chidsey, Jr., T. A. Ryer, R. D. Adams and K. McClure, 2004, Geologic framework, facies paleogeography, and reservoir analogs, in Chidsey, T. C., R. D. Adams and T. H. Morris, (eds.), Regional to wellbore analog for fluvial-deltaic reservoir modeling: The Ferron Sandstone of Utah, AAPG Studies in Geology 50, p.331-356.

1. Ryer, T. A., 1974, Review of "The nature of the stratigraphical record," by D. V. Ager:  The American Scientist, v. 82, no. 4, p. 482.
2. Ryer, T. A., 1975, Patterns of Cretaceous shallow marine sedimentation, Coalville and Rockport areas, Utah:  Geol. Soc. of America, Abstracts with programs, v. 7, no. 7, p. 1255.
3. Ryer, T. A., 1976, Tides in the Interior Cretaceous seaway of western North America:  Geol. Soc. America, Abstracts  with programs, v. 8, no. 6, p. 1082.
4. Ryer, T. A., 1977, Patterns of Cretaceous shallow-marine sedimentation and faunal response, north-central Utah:  Jour. of Paleontology, v. 51, supplement to no. 2, North Amer. Paleontological Convention II, Abstracts of papers, p. 24.
5. Ryer, T. A., 1977, Models of shallow marine cyclic sedimentation, Western Interior Cretaceous, North America:  Amer. Assoc. Petroleum Geol. Bull., v. 61, no. 5, p. 824.
6. Ryer, T. A., Phillips, R. E., Bohor, B. F., and Pollastro, R. M., 1979, Use of altered volcanic ash falls in stratigraphic studies of coal-bearing sequences--An example from the Upper Cretaceous Ferron Sandstone Member in central Utah:  Geol. Soc. America, Abstracts with programs, v. 11, no. 7, p. 508.
7. Ryer, T. A.,1979, Deltaic coals of the Ferron Sandstone Member of the Mancos Shale--Predictive model for Cretaceous coals of the Western Interior:  Amer. Assoc. Petroleum Geol. Bull., v. 63, no. 3, p. 519.
8. Ryer, T. A., 1979, Depositional setting of coals in Upper Cretaceous Ferron Sandstone Member, central Utah:  Amer. Assoc. Petroleum Geol. Bull., v. 63, p. 840.
9. Ryer, T. A., 1980, Cyclicity in Upper Cretaceous strata, Rocky Mountain region:  Geol. Soc. America, Abstracts with programs, v. 12, p. 79-80.
10. Ryer, T. A., and Kauffman, E. G., 1980, Physical evidence for Cretaceous tides, Western Interior basin, North America:  Amer. Assoc. of Petroleum Geol. Bull., v. 64, p. 778-779.
11. Kauffman, E. G., and Ryer, T. A., 1980, Paleobiological evidence for Cretaceous tides, Western Interior basin, North America:  Amer. Assoc. of Petroleum Geol. Bull., v. 64, no. 5, p. 731.
12. Ryer, T. A., 1981, Eustatic control of distribution of lower Upper Cretaceous coal beds in Utah--Application in coal exploration:  Amer. Assoc. Petroleum Geol. Bull., v. 65, no. 5, p. 984.
13. Ryer, T. A., 1982, Cretaceous transgressive-regressive cycles--Importance in coal geology:  International Assoc. Sedimentologists, Eleventh Congress on Sedimentology, Hamilton, Ontario, Canada, Abstracts of Papers, p. 55.
14. Lawrence, D. T., Kauffman, E. G., Fursich, F., and Ryer, T., 1982, Paleobiological refinement of models for Cretaceous coal depositional systems, Western Interior, North America:  Geol. Soc. America, Abstracts with Programs, 95th Annual Meeting, v. 14, no. 7, p. 542.
15. Ryer, T. A., Horne, J. C., and Hayes, M. O., 1983, Depositional and exploration models for Cretaceous Lower Mannville fluvial sandstones of south-central Alberta:  Amer. Assoc. Petroleum Geol. Bull., v. 67, no. 3, p. 543.
16. Ryer, T. A., Horne, J. C., and Hayes, M. O., 1983, Aggradational valley-fill model for strata of Lower Cretaceous Mannville Formation, south-central Alberta (Abs):  Abstracts and programs, The Mesozoic of Middle North America, Canadian Soc. of Petroleum Geol., p. 76. 
17. Simon, F. O., Affolter, R. H., and Ryer, T. A., 1984, Influence of a marine transgression on the geochemistry of the C coal bed, Emery coal field, Utah:  International Chemical Congress of Pacific Basic Societies, Honolulu, Hawaii, Abstracts of Papers, item 07C12.
18. Ryer, T. A., 1985, Review of "Terrigenous clastic depositional systems--Applications in petroleum, coal, and uranium exploration" by W.E. Galloway and D.K. Hobday:  Amer. Assoc. Petroleum Geol. Bull., v. 69, no. 1, p. 137.
19. Ryer, T. A., and E. R. Gustason, 1985, Stratigraphy, depositional history and petroleum geology of Lower Cretaceous Fall River Formation, Powder River Basin, Wyoming:  Amer. Assoc. Petroleum Geol. Bull., v. 69, p. 864.
20. Ryer, T. A., and E. R. Gustason, 1985, Stratigraphy and depositional history of Coyote Creek-Miller Creek trend, Lower Cretaceous Fall River Formation, Powder River Basin, Wyoming:  Amer. Assoc. Petroleum Geol. Bull., v. 69, p. 864.
21. Ryer, T. A., and J. R. Lovekin, 1985, Upper Cretaceous Vernal Delta of Utah--Depositional or paleotectonic feature?:  Amer. Assoc. Petroleum Geol. Bull., v. 69, p. 864.
22. Gustason, E. G., and T. A. Ryer, 1985, Stratigraphy and depositional history of Lakota and Cloverly Formations, Powder River Basin, Wyoming: Amer. Assoc. Petroleum Geol. Bull., v. 69, p. 850.
23. Gustason, E. R., and T. A. Ryer, 1985, Stratigraphy, depositional history, and trapping mechanisms of Lone Tree Creek and Lodgepole Creek oil fields, Lower Cretaceous Fall River Formation, Powder River Basin, Wyoming:  Amer. Assoc. Petroleum Geol. Bull., v. 69, p. 850.
24. Ryer, T. A., 1986, The Upper Cretaceous Ferron-Frontier clastic wedge, Utah and Wyoming--Interplay between sea level, sediment supply and subsidence:  Amer. Assoc. Petroleum Geol. Bull., v. 70, no.8, p. 1053-1054
25. Ryer, T. A., E. R. Gustason, and S. K. Odland, 1986, Stratigraphy, sea-level fluctuations, and depositional history of the Lower Cretaceous Muddy Sandstone, northern Powder River Basin, Wyoming:  Amer. Assoc. Petroleum Geol. Bull., v. 70, no. 8, p. 1054.  (Winner of A.I. Levorsen Award for best paper.)
26. Gustason, E. R., T. A. Ryer, and S. K. Odland, 1986, Unconformities and facies relationships of the Muddy Sandstone, northern Powder River Basin, Wyoming and Montana:  Amer. Assoc. Petroleum Geol. Bull., v. 70, no. 8, p. 1042.
27. Ryer, T. A., 1986, Ancient meander belts as stratigraphic traps, Rocky Mountain region, USA and Canada:  Canadian Society of Petroleum Geologists Reservoir, v. 13, no. 9, p. 1-2.
28. Ryer, T. A., 1987, Distinuishing eustatic and tectonic causes of major clastic wedges in foreland basin settings--Examples from the Cretaceous of the Rocky Mountain region:  Abstracts with Program, Rocky Mountain Section GSA meeting, May, 1987.
29. Ryer, T. A., 1987, Distinguishing eustatic and tectonic contributions to major clastic wedges in Cretaceous foreland basin, Wyoming and Utah:  Geological Society of Canada Annual Meeting, Program with Abstracts, vol. 12, p. 86.
30. Gustason, E. R., and T. A. Ryer, 1987, Fluvial architecture of the Muddy Sandstone, Powder River Basin, Wyoming:  Abstracts with Program, Rocky Mountain Section GSA meeting, May, 1987.
31. Ryer, T. A., J. J. McClurg and M. M. Muller, 1987, Depositional history of the Dakota Sandstone, Moxa Arch and vicinity, southwestern Wyoming--Implications for early evolution of Cretaceous foreland basin:  Amer. Assoc. Petroleum Geol. Bull., v. 71, no. 5, p. 609.
32. Ryer, T. A., 1987, Stratigraphy, sedimentology, and palaeoenvironments of the Viking Formation, southern Alberta:  Canadian Soc. Petroleum Geol. Reservoir, v. 14, no. 6, p. 1-2.
33. Gustason, E. R., D. A. Wheeler, and T. A. Ryer, 1988, Structural control on paleovalley development, Muddy Sandstone, Powder River Basin, Wyoming:  Amer. Assoc. Petroleum Geol. Bull., v. 72, no. 7, p. 871.
34. Ryer, T. A., 1990, Relative importance of fluctuations in sea level and sediment supply in the origin of mid-Cretaceous clastic wedges, central Rocky Mountain region (Abs):  SEPM Research Conference Proceedings--Cretaceous Resources, Events, and Rhythms, Denver, CO August 20-24.
35. Bobb, M. C., and T. A. Ryer, 1990, Upper Cretaceous Calico bed, southwestern Utah--Sedimentology, sea level, and paleotectonics:  Amer. Assoc. Petroleum Geol. Bull., v. 74, no. 8, p. 1316.
36. Ryer, T. A., 1990, The Cretaceous section at Coalville, Utah:  Amer. Assoc. Petroleum Geol. Bull., v. 74, no. 8, p. 1344.
37. Ryer, T. A., 1991, Lower Cretaceous Avile Sandstone, Neuquen Basin, Argentina--Exploration model for a lowstand clastic wedge in a back-arc basin:  Amer. Assoc. Petroleum Geol. Bull. 75, p. 665.
38. Merewether, E. A., J. Dolson, W. B. Hanson, W. R. Keefer, B. E. Law, R. E. Mueller, T. A. Ryer, A. C. Smith, D. P. Stilwell, D. M. Wheeler, and F. G. Ethridge, 1991, The Cretaceous record in a northeast-trending transect, northern Utah to east-central Wyoming:  Amer. Assoc. Petroleum Geol. Bull. 75, p. 634
39. Ryer, T. A., 1991, Origin of mid-Cretaceous clastic wedges, central Rocky Mountain region (extended abstract) in J. Dolson, compiler, Unconformity related hydrocarbon exploitation and accumulation in clastic and carbonate settings:  Rocky Mountain Association of Geologists Course Notes, p. 16-20.
40. Ryer, T. A., 1992, Characteristics of parasequences of transgressive systems tracts deposited in foreland basins--Examples from the Cretaceous Frontier and Dakota Formations, Utah and Wyoming:  Amer. Assoc. Petroleum Geol., 1992 Annual Convention, Program, p. 112-113.
41. Ryer, T. A., 1992, Characteristics of parasequences of transgressive systems tract deposited in foreland basins--The Upper Cretaceous Dakota Sandstone, Utah:  SEPM Theme Meeting--Mesozoic of the Western Interior, Ft. Collins, CO, Aug. 17-19, 1992, Abstracts, p. 58.
42. Ryer, T. A., 1992, The origin of mid-Cretaceous clastic wedges, central Rocky Mountain region:  SEPM Theme Meeting--Mesozoic of the Western Interior, Ft. Collins, CO, Aug. 17-19, 1992, Abstracts, p. 58-59.
43. Ryer, T. A., 1993, The autochthonous component of cyclicity in shoreline deposits of the Upper Cretaceous Ferron Sandstone, central Utah:  Amer. Assoc. Petroleum Geol., 1993 Annual Convention, Program, p. 175.
44. Ryer, T. A., 1993, The Upper Cretaceous Ferron Sandstone of Central Utah--An Overview:  Amer. Assoc. Petroleum Geol. Bull., v. 77, p. 1459.
45. Ryer, T. A., and P. B. Anderson, 1995, Parasequence sets, parasequences, facies distributions, and depositional history of the Upper Cretaceous Ferron deltaic clastic wedge, central Utah:  Amer. Assoc. Petroleum Geol. Bull., v. 79/6, p. 924. (Winner of A.I. Levorsen award for best paper.)
46. Ryer, T. A., J. A. Dewey, Jr., and T. H. Morris, 1995, Distinguishing allocyclic and autocyclic causes of parasequence-level cyclicity--Lessons from deltaic strata of the Upper Cretaceous Ferron Sandstone, central Utah: Amer. Assoc. Petroleum Geol. Bull., v. 79/6, p. 924.
47. Anderson, P. B., and T. A. Ryer, 1995, Proposed revisions to parasequence-set nomenclature of the Upper Cretaceous Ferron Sandstone Member of the Mancos Shale, central Utah: Amer. Assoc. Petroleum Geol. Bull., v. 79/6, p. 914-915.
48. Dewey, J. A, Jr., T. H. Morris, and T. A. Ryer, 1995, Constraining reservoir models of fluvial- vs. wave-dominated delta-front sandstones using high density sequence stratigraphic analysis, Ferron Sandstone, Utah: Amer. Assoc. Petroleum Geol. Bull., v. 79/6, p. 917.
49. Adams, R. D., T. C. Chidsey Jr., M. D. Laine, P. B. Anderson, T. A. Ryer, 1995, Integrated multidisciplinaryreservoir characterization of a deltaic system-1: Architecture and lithofacies of the Cretaceous-age Ferron Sandstone, east-central Utah (Abs.):  Amer. Assoc. Petroleum Geol. Bull., v. 79, p. 1.
50. Anderson, P. B., T. A. Ryer, and T. C. Chidsey, 1996, Ferron Sandstone -- Stratigraphy and reservoir analogs, east-central Utah:  Amer. Assoc. Petroleum Geol. Bull., v. 80, p. 965.
51. Ryer, T. A., 1997, Fluvial strata of the Barrancas Formation, Lunlunta-Carrizal field:  Proceedings, Second Reservoir Characterization Meeting, YPF, Bariloche, Argentina.
52. Ryer, T. A., C. Garcia, M. Sola, and E. Zardo, 1998, A fluvial reservoir model for Middle Jurassic Challaco Formation reservoirs, Octogono Fiscal, Huincul Arch, Neuquen Basin, Argentina, Abstracts, AAPG Annual Meeting, Meeting Abstracts published as CD ROM.
53. Ryer, Thomas A., Jurgen Meyer, Mark Bagge, Nick J. Comrie-Smith and Gertjan Van Mechelen, 2000, Sequence stratigraphy and depositional history, Upper Sandy Member of Gabus Formation (Miocene), Kerisi-Hiu area, West Natuna Basin, South China Sea, Indonesia:  Extended abstract distributed on CD ROM at Amer. Assoc. Petroleum Geol. Annual Meeting, New Orleans, 6 pages, 6 figs in PDF format.
54. Ryer, Thomas A., Chet Ozgen, and  Nidia Rios, 2000, Deterministic and stochastic, object-based models for a complex, fluvial reservoir in the Jurassic Barrancas Formation, Lunlunta-Carrizal field, Cuyo Basin, Argentina: Extended abstract distributed on CD ROM at Amer. Assoc. Petroleum Geol. Annual Meeting, New Orleans, 6 pages, 12 figs in PDF format.
55. Kusiak , Maria E., Thomas A. Ryer and Jose G. Salinas, 2000, Sequence stratigraphy and facies of Carboniferous glacio-eustatic reservoirs of the La Pena and Tundy fields, Chaco Basin, Bolivia:  Extended abstract distributed on CD ROM at Amer. Assoc. Petroleum Geol. Annual Meeting, New Orleans, 6 pages, 8 figs in PDF format.
56. Sun Chee Fore, Vanon K., Thomas A. Ryer, Nodar Siradze and Reginal Spiller, 2000, Distinguishing Miocene and Pliocene reservoir facies in Block 12, Western Kura Basin, Republic of Georgia, using outcrop and subsurface data: Extended abstract distributed on CD ROM at Amer. Assoc. Petroleum Geol. Annual Meeting, New Orleans, 250-word abstract in PDF format.
57. Bagge, M., T. A. Ryer, T. Rahn, R. Gir, J. Meyer, M. Ali, N. J. Comrie-Smith, and G. Van Mechelen, 2000, An integrated approach to field appraisal in the Kerisi and Hiu fields, South Natuna Sea, Indonesia:  Abstract distributed on CD ROM at Amer. Assoc Petroleum Geol. Meeting, Bali, Indonesia.
58. Pinous, O., M. Kourenko, T. Ryer, and G. Archard, 2002, New sequence stratigraphic interpretation of the Jurassic Vasyugan sandstone reservoirs of the West Siberia:  Abstract, 2002 Annual AAPG Meeting. 

Over 1,500 geoscientists and engineers have participated in over 125 short courses or field courses taught by Thomas A. Ryer. The following is a list of the companies at which they were then employed.

Aberford Resources

AEC

AGIP

Alberta Energy and Natural Resources

Alberta Geological Survey

Amerada Hess

American Overseas Petroleum

Ameriven

Amoco

Anadarko

Andina

ANR Production

Apex Petroleum

ARCO

Astra C.A.P.S.A.

Barrett Resources

Bass Enterprise Production

Beard Oil

Belport Oil

Beneco

Bowling Green State University

BP-Amoco

British Gas

BTA Oil Producers

U.S. Bureau of Land Management

Burlington Resources

Brigham Young University

Caber Exploration

Cabot Oil and Gas

Cam West

Canadian Natural Resources

Canadian Natural Resources

Canadian Occidental Petroleum

Canadian Oil and Gas Lands Administration

Canadian Society of Petroleum Geologists

Capstan Holdings

Celsius Energy

Chevron

Cities Service

CNG Production

Coastal Oil and Gas

Columbia Gas

Conoco

Corpoven

Crescendo Resources

Dansk Oil and Gas

DeGolyer and MacNaughton

Devon Energy Corp.

Discovery Group

Ecopetrol

El Paso Exploration

Enron Oil and Gas

Ensign Oil and Gas

EOG Resources

Equity Oil

EXXON Coal Resources

EXXON Production Research

ExxonMobil

Flying "J" Oil and Gas

Gas Research Institute

Geological Survey of Bengladesh

Geological Survey of Greenland

Geological Survey of Canada

Goolsby Brothers

GTI E&P Services Canada

Gulf

GUPCO

Heritage Exploration

Hocol

Home Oil

Hunt Oil

Husky Oil

Idiemitsu Oil and Gas

Imperial Oil

Inst General Geology

Institute of Marine Geology

Intensity

Intevep

Japan Vietnam Petroleum Company

Kentucky Geological Survey

Klabzuba Oil and Gas

Koch Exploration

Magin Energy

Marathon

Maraven

Mark Resources

Memorial University

Meridian Oil

Mitchell Energy and Development

Mobil

Montana Geological Society

Morgan Hydrocarbons

Murphy

Nearburg Producing

Neste OY Exploration

New Zealand Oil and Gas

Nexen

Nicor Exploration

Norcen Energy

North Canadian Oils

Northstar Energy

Numac Energy

Occidental Oil and Gas Corp.

Oil Company of Australia

Oklahoma Geological Survey

OMV AG

Oxford Consolidated

P&T Consulting

PanCanadian Petroleum

Pangea Energy

PDVSA

Pembina Resources

Pemex

Perez Companc

Petrobras

Petro-Canada Resources

Phillips Petroleum

Pinnacle International

Pittsburgh Geological Society

Placer Cego Petroleum

Pluspetrol Exploracion y Produccion

Portland State University

Presidio Exploration

Preussag GmbH Energie

PTT Exploration and Production

Repsol YPF

Richland Petroleum

Rio Alto Exploration

Ryan Exploration

Sabine Production

Samson

Sask Oil

Saudi Aramco

Sceptre

Schlumberger

Schneider & Co.

Sego Resources

Servicio Geologico Nacional y CONICET

Sharon Resources

Shell

Sibneft

Sipetrol

Snyder Oil Corp.

Sohio

Southern Illinois University

Southland Royalty

Sproule

Standard Oil

State of Alaska, Department of Natural Resources

State University of New York at Albany

Sunbold Energy Consulting

Sundance Oil

Talisman Energy

Tecpetrol

Tenneco

Texaco

Thomson Jensen Petroleum

Total Petroleum

U.S. Geological Survey

Ulster Petroleums

Union Texas Petroleum

Universal Geoscience Consulting

University of Alabama

University of Kansas

University of Southern California

University of Wyoming

Unocal

Uppsala University

Utah Division of Oil and Gas

Utah Geological Survey

Utah International

Utah State University

Vastar Resources

Veba Oel AG

Vessels Oil and Gas

Wascaca Energy

West Coast Geological Society

Westburne Petroleum and Minerals

Western Gas Marketing

Western Geco

Wexpro

White Eagle Exploration