Thomas E. Williamson

Vertebrate Paleontology, Stratigraphy

Publications

                                                                                                   Contact Me for reprints or PDFs

2013

Evans, D. C., T. E. Williamson, M. A. Loewen, and J. I. Kirkland. 2013. A review of pachycephalosaurid dinosaurs from Grand Staircase-Escalante National Monument, southern Utah. In A. L. Titus and M. A. Loewen (eds.), At the Top of the Grand Staircase: The Late Cretaceous of Southern Utah (Life of the Past), in p. 482-487. Indiana University Press, Bloomington.

Heizler, M. T., I. P. Mason, and T. E. Williamson, 2013. My Dates – Community Rates. William Smith Meeting of the Geological Society of London, Abstract with Programs. (abstract)

Heizler, M. T., I. P. Mason, T. E. Williamson, D. J. Peppe, J. Ramezani, and S. A. Bowring. 2013. 40Ar/39Ar Chronostratigraphy of Cretaceous and Paleocene strata in the San Juan Basin, New Mexico: Accuracy limitations of high precision measurements. Geological Society of America, Abstract with Programs 114-9.

Lofgren, D., T. E. Williamson, and R. Nydam, 2013. New Records of eutherian and metatherian mammals from the Goler Formation of California. Journal of Vertebrate Paleontology, Program and Abstracts, 2013:164. (abstract)

Mason, I. P., M. T. Heizler, and T. E. Williamson, 2013. 40AR/39AR sanidine chronostratigraphy of K-Pg boundary sediments of the San Juan Basin, NM. New Mexico Geology. (abstract)

Mason, I. P., M. T. Heizler, and T. E. Williamson, 2013. 40AR/39AR sanidine chronostratigraphy of K-Pg boundary sediments of the San Juan Basin, NM. Geological Society of America, Rocky Mountain Section, Abstract with Programs 15-4. (abstract)

Peppe, D. J., M. T. Heizler, T. E. Williamson, I. P. Mason, S. L. Brusatte, A. Weil, and R. Secord. 2013. New age constraints on Upper Cretaceous through lower Paleocene age rocks in the San Juan Basin, New Mexico. Geological Society of America, Abstracts with Programs 114-10. (abstract)

Templeman, T. and T. E. Williamson. 2013. The Armijo Draw local fauna from the Santonian – lower Campanian Menefee Formation, San Juan Basin, New Mexico. Journal of Vertebrate Paleontology, Program and Abstracts, 2013:224. (abstract)

Williamson, T. E. 2013. An explosive diversification of mammals following the end of the Age of Reptiles. www.walkingwithdinosaurs.com.

Williamson, T. E. and S. L. Brusatte. 2013. New specimens of Wortmania (Mammalia: Taeniodonta) from the early Paleocene (Puercan) of New Mexico. Journal of Vertebrate Paleontology, Program and Abstracts, 2013:238. (abstract)

Williamson, T. E. and S. L. Brusatte. 2013a. New specimens of the rare taeniodont Wortmania (Mammalia: Eutheria) from the San Juan Basin of New Mexico and comments on the phylogeny and functional morphology of “archaic” mammals. PLoS ONE 8(9): e75886. doi:10.1371/journal.pone.0075886.

Williamson, T. E. and S. L. Brusatte. 2013b. Taxon-character dataset from Williamson and Brusatte (2013a). Morphobank, Project 1045.

Williamson, T. E. and D. Lofgren. 2013. Late Paleocene (Tiffanian) metatherians from the Goler Formation. Journal of Vertebrate Paleontology.

Williamson, T. E. and T. Templeman, 2013. A new vertebrate local fauna from the Menefee Formation, San Juan Basin, New Mexico. New Mexico Geology. (abstract)

Williamson, T. E. and A. Weil. 2013. Small theropod teeth from the Upper Cretaceous Fruitland and Kirtland formations (late Campanian Hunter Wash and late Maastrichtian Alamo Wash local faunas), San Juan Basin, northwestern New Mexico. Burpee Museum of Natural History PaleoFest Program with Abstracts. (abstract)

 2012

 T. E. Williamson, and P. J. Fawcett. 2012. Early Paleocene temperature and precipitation estimates from paleosols at Kimbeto Wash, San Juan Basin, New Mexico, U.S.A. Geological Society of America, Program with Abstracts 44(6): 69. (abstract)

Secord, R., T. E. Williamson, and A. Weil. 2012. Stable isotope ecology of early Paleocene (Puercan and Torrejonian) mammals from the San Juan Basin, New Mexico. Journal of Vertebrate Paleontology, Program and Abstracts, 2012:170. (abstract)

 Silcox, M. T. and T. E. Williamson. 2012. New discoveries of primates from the early Paleocene Nacimiento Formation (Torrejonian NALMA), San Juan Basin, New Mexico. Journal of Human Evolution 63:805-833.

 Weil, A., B. McCullough, and T. E. Williamson. 2012. Newly reported multituberculate mammals from the Paleocene of the San Juan Basin of New Mexico. Geological Society of America, Program with Abstracts 44(6):90. (abstract)

 Williamson, T. E. 2012. Geological description of cover photograph of Angel Peak. New Mexico Geology 34:2.

Williamson, T. E., S. L. Brusatte, T. D. Carr, A. Weil, and B. R. Standhardt. 2012a. The phylogeny and evolution of Cretaceous-Paleogene metatherians: New cladistic analysis and description of new early Paleocene specimens from the Nacimiento Formation, New Mexico: Journal of Systematic Palaeontology 10:625-651.

 Williamson, T. E., S. L. Brusatte, T. D. Carr, A. Weil, and B. R. Standhardt. 2012b. Taxon-Character dataset from Williamson et al. (2012a). Morphobank, Project 682.

 Williamson, T. E., S. L. Brusatte, D. J. Peppe, R. Secord, and A. Weil. 2012. No evidence for conformable contact between the Ojo Alamo Sandstone and the Nacimiento Formation. New Mexico Geology 34: . (abstract)

 Williamson, T. E., S. L. Brusatte, D. J. Peppe, R.  Secord, and A. Weil. 2012. Early Paleocene climate change and biotic recovery of plants and animals of the San Juan Basin, New Mexico: A preliminary report.  Geological Society of America, Program with Abstracts 44(6):69. (abstract)

Williamson, T. E. and T. D. Carr. 2012. Bomburodon, a new name for the Paleocene mammal Bomburia Van Valen, 1978. Journal of Paleontology. 86:567.

 Williamson, T. E. and M. T. Silcox. 2012. New discoveries of primates from the early Paleocene Nacimiento Formation (Torrejonian NALMA), San Juan Basin, New Mexico: A window on the first Primate adaptive radiation. Journal of Vertebrate Paleontology, Program and Abstracts, 2012:194.

 2011

 Carr, T. D., T. E. Williamson, B. B. Britt, and K. Stadtman. 2011. A new genus of short-skulled tyrannosaurid from the Upper Cretaceous (upper Campanian) Kaiparowits Formation of Utah. Naturwissenschaften. 98(3):241-246.

 Chester, S. G. B., J. I. Bloch, E. J. Sargis, M. T. Silcox, T. E. Williamson. 2011. Arboreality in palaechthonid plesiadapiforms (Mammalia, Primates): New evidence from a partial skeleton of early Paleocene Torrejonia wilsoni. Journal of Vertebrate Paleontology 31:87A. (abstract)

 D’Emic, M. D.; J. A. Wilson, and T. E. Williamson. 2011. A sauropod dinosaur pes from the latest Cretaceous of North America and the validity of Alamosaurus sanjuanensis. Journal of Vertebrate Paleontology 31:1072-1079.

 Tremaine, K. and T. E. Williamson. 2011. Examining the Torrejonian To2-To3 Boundary in the Nacimiento Formation, San Juan Basin, New Mexico. Geological Society of America, Northeastern/North-Central sections, Abstracts with Programs. (abstract)

 Williamson, T. E., D. J. Peppe, R. Secord, S. L. Brusatte, A. Weil. 2011. A long-term terrestrial record of early Paleocene climate and ecosystem change in the San Juan Basin, New Mexico. Journal of Vertebrate Paleontology 31:214-215A. (abstract)

 Williamson, T. E., and L. Taylor. 2011. New species of Peradectes and Swaindelphys (Mammalia; Metatheria) from the early Paleocene (Torrejonian) Nacimiento Formation, San Juan Basin, New Mexico. Palaeontologia Electronica 14.

 Williamson, T. E. and A. Weil. 2011. A new early Paleocene (Puercan) hyopsodontid “condylarth” from New Mexico. Acta Palaeontologica Polonica 56:247-255.

 Williamson, T. E., A. Weil, and B. Standhardt. 2011a. Cimolestids (Mammalia) from the early Paleocene (Puercan) of New Mexico. Journal of Vertebrate Paleontology 31(1):162-180.

 Williamson, T. E., A. Weil, and B. Standhardt. 2011a. Taxon-character dataset from Williamson et al. (2011a). Morphobank, Project 496

 2010

 Aubele, J. C., P. J. Gegick, S. G. Lucas, G. S. Morgan, T. E. Williamson, and B. B. Sisneros. 2010. Citizen science in a museum setting. Geological Society of America, Abstracts with Programs. (abstract)

Carr, T. D. and T. E. Williamson. 2010. Bistahieversor sealeyi gen. et sp. nov., a new tyrannosaur from New Mexico and the origin of deep snouts in Tyrannosauroidea. Journal of Vertebrate Paleontology 30:1-16.

Hunt-Foster, R. K., T. E. Williamson, N. R. Longrich. 2010. Attempted relocation of the 1941 University of Oklahoma Pentaceratops Quarry, San Juan County, New Mexico. New Mexico Geology 32:. (abstract)

 Shimada, K., T. E. Williamson, and P. L. Sealey. 2010. A new gigantic pycnodont fish from the Juana Lopez Member of the Upper Cretaceous Mancos Shale of New Mexico, U.S.A. Journal of Vertebrate Paleontology. 30:598-603.

 Tanaka, K., D. K. Zelenitsky, T. Williamson, A. Weil, and F. Therrien. 2010. Description of fossil eggshells from the Upper Cretaceous Fruitland Formation (upper Campanian), New Mexico. Historical Biology. 1-15.

 Williamson, T. E. 2010. A unique 10-million-year paleontological record in the Bisti/De-na-zin Wilderness Area. National Landscapes Conservation System, A Decade of Discovery Conference, Abstract with Programs, p. 29. (abstract)

 Williamson, T. E., S. L. Brusatte, and A. Weil. 2010. Phylogeny of Cretaceous-Paleocene metatherians: Implications for the metatherian radiation and survivorship of lineages across the K/Pg Boundary. Journal of Vertebrate Paleontology (abstract)

2009

Schott, R., D. Evans, T. E. Williamson, T. Carr, and M. Goodwin. 2009. The anatomy and systematics of Colepiocephale lambei (Dinosauria: Pachycephalosauridae). Journal of Vertebrate Paleontology 29:771-786.

Williamson, T. E., T. D. Carr, S. A. Williams, and K. Tremaine. 2009. Early ontogeny of pachycephalosaurine squamosals as revealed by juvenile specimens from the Hell Creek Formation, eastern Montana. Journal of Vertebrate Paleontology 29:291-294.

 Williamson, T. E., B. S.Kues, G. S. Weissmann, T. A. Stidham, and S. L. Yurchyk. 2009. A Cretaceous feather from the Upper Cretaceous (lower Campanian) Point Lookout Sandstone, San Juan Basin, northwestern New Mexico. Cretaceous Research 30:547-550.

2008

Williamson, T. E., D. Nichols, and A. Weil. 2008. Paleocene palynomorph assemblages from the Nacimiento Formation, San Juan Basin, New Mexico. New Mexico Geology 30:3-11.

 Williamson, T. E. and A. Weil. 2008a. Therian mammals from the Naashoibito Member, Kirtland Formation, San Juan Basin, New Mexico and their biochronologic and paleobiogeographic significance. Journal of Vertebrate Paleontology 28:803-815.

 Williamson, T. E. and A. Weil. 2008b. Stratigraphic distribution of sauropods in the Upper Cretaceous of the San Juan Basin, New Mexico, with comments on North America’s Cretaceous ‘sauropod hiatus.’ Journal of Vertebrate Paleontology 28:1218-1223.

2007

Brusatte, S. L., R. B. J. Benson, T. D. Carr, T. E. Williamson, and P. C. Sereno. 2007. The systematic utility of enamel wrinkles. Journal of Vertebrate Paleontology 27:1052-1056.

Morgan, G. and T. E. Williamson. 2007. Miocene trackways. New Mexico Museum of Natural History and Science Bulletin 42:319-330.

 Williamson, T. E. and T. D. Carr. 2007. Bomburia and Ellipsodon (Mammalia, Mioclaenidae) from the early Paleocene of New Mexico. Journal of Paleontology 81:966-985. 

Williamson, T. E. and T. D. Carr. 2007. Revision of the problematic early Paleocene genus Oxyclaenus (Mammalia: Oxyclaenidae) and a new species of Carcinodon. Journal of Vertebrate Paleontology 27:973-986.


2006

Farke, A. and T. E. Williamson. 2006. A ceratopsid dinosaur parietal from New Mexico and its implications for ceratopsid biogeogreaphy and systematics. Journal of Vertebrate Paleontology 26:1018-1020.

Williamson, T. E. and T. D. Carr. 2006. First Record of a pachycephalosaurine (Ornithischia: Pachycephalosauria) from the Dinosaur Park Formation, Alberta, Canada. New Mexico Museum of Natural History Bulletin 35:323-327.


2005

Carr, T. D. and T. E. Williamson. 2005. Diversity of Late Maastrichtian Tyrannosauridae (Dinosauria, Theropoda). Zoological Journal of the Linnean Society 142:479-523.

 Carr, T. D., Williamson, T. E., and Schwimmer, D. R. 2005. A new genus and species of tyrannosauroid from the Late Cretaceous (Middle Campanian) Demopolis Formation of Alabama. Journal of Vertebrate Paleontology 25:119-143.

Clemens, W. A. and T. E. Williamson. 2005. A new species of Eoconodon (Triisodontidae, Mammalia) from the San Juan Basin, New Mexico. Journal of Vertebrate Paleontology 25:208-213.


2004

Lofgren, D. L., J. A. Lillegraven, W. A. Clemens, P. D. Gingerich, and T. E. Williamson. 2004. Paleocene biochronology of North America: The Puercan through Clarkforkian land mammal ages, Pp. 43-105, In M. O. Woodburne (ed.), The first North American land mammal ages of the Cenozoic Era, University of California Press.


2003

Williamson, T. E. and T. D. Carr. 2003. a new genus of derived pachycephalosaurian from western North America. Journal of Vertebrate Paleontology 22:779-801.


2001

McKinney, K. C., R. H. Tedford, G. S. Morgan, and T. E. Williamson. 2001. Fossil mammals of the Middle Rio Grande: Annotated Dataset and Bibliography of New Mexico Verbebrate Paleontology. United States Geological Survey, Open File Report.

Williamson, T. E. 2001. Meniscotherium mass-death assemblages. Pp. 335-360 in G. Gunnell, (ed.), Eocene Biodiversity: Unusual Occurrences and Rarely Sampled Habitats, New York, Plenum Press.


2000

Carr, T. D. and T. E. Williamson. 2000. A review of Tyrannosauridae (Dinosauria, Coelurosauria) from New Mexico. New Mexico Museum of Natural History Bulletin17:113-145.

Morgan, G. M. and T. E. Williamson. 2000. Middle Miocene (late Barstovian) vertebrates from the Benavidez Ranch local fauna, Albuquerque Basin, New Mexico. New Mexico Museum of Natural History Bulletin 16:195-207.

O’Leary, M. A., S. G. Lucas, and T. E. Williamson. 2000. A new specimen of Ankalagon (Mammalia, Mesonychia) and evidence of sexual dimorphism in mesonychians. Journal of Vertebrate Paleontology 20:387-393. 

Williamson, T. E. 2000. Review of Hadrosauridae (Dinosauria, Ornithischia) from the San Juan Basin, New Mexico. New Mexico Museum of Natural History Bulletin 16:191-213.


1999

Sullivan, R. M. and T. E. Williamson. 1999. A new skull of Parasaurolophus (Dinosauria: Hadrosauridae) from the Kirtland Formation of New Mexico and a revision of the genus. New Mexico Museum of Natural History Bulletin 15, 52 pp.


1998

Janis, C. M., J. D. Archibald, R. L. Cifelli, S. G. Lucas, C. R. Schaff, R. M. Schoch, and T. E. Williamson. 1998. Archaic ungulates and ungulate-like mammals, pp. 247-259, in C. M. Janis, K. M. Scott, and L. L. Jacobs (eds.), Evolution of Tertiary Mammals of North America. Cambridge, Cambridge University Press.

Lucas, S. G., R. M. Schoch, and T. E. Williamson. 1998. Taeniodonta, in C. M. Janis, K. M. Scott, and L. L. Jacobs (eds.), Evolution of Tertiary Mammals of North America. Cambridge, Cambridge University Press.


1997


Lucas, S. G., S. M. Cather, J. C. Abbott, and T. E. Williamson. 1997. Stratigraphy and tectonic implications of Paleogene strata in the Laramide Galisteo Basin, north-central New Mexico. New Mexico Geology 19:89-95.

Lucas, S. G., J. W. Estep, T. E. Williamson, and G. S. Morgan (eds.). 1997. New Mexico’s Fossil Record 1. New Mexico Museum of Natural History Bulletin 11, 143 p. 

Lucas, S. G., T. E. Williamson, and M. Middleton. 1997. Catopsalis (Mammalia: Multituberculata) from the Paleocene of New Mexico and Utah: taxonomy and biochronological significance.  Journal of Paleontology 71:484-493.

Sullivan, R. M. and T. E. Williamson. 1997. Additions and corrections to Sternberg’s San Juan Basin collection, Paleontological Museum, University of Uppsala, Sweden.  New Mexico Geological Society, Guidebook 48:255-257. 

Williamson, T. E. 1997. A new Late Cretaceous (early Campanian) vertebrate fauna from the Allison Member, Menefee Formation, San Juan Basin, New Mexico.  New Mexico Museum of Natural History, Bulletin 11:51-59.

 Williamson, T. E. and S. G. Lucas. 1997. The Chico Springs locality, Nacimiento Formation, San Juan Basin, New Mexico.  New Mexico Geological Society, Guidebook 48:259-265.

1996

Lucas, S. G. and T. E. Williamson, J. W. Estep, A. P. Hunt, and O. J. Anderson. 1996. Jurassic Fossil Vertebrates from New Mexico.  Museum of Northern Arizona Bulletin 60:235-241.

Williamson, T. E. 1996. The beginning of the age of mammals in the San Juan Basin, New Mexico: biostratigraphy and evolution of Paleocene Mammals of the Nacimiento Formation.  New Mexico Museum of Natural History Bulletin 8, 141 pp.

Williamson, T. E. 1996. ?Brachychampsa sealeyi, sp. nov., (Crocodylia, Alligatoroidea) from the Upper Cretaceous (lower Campanian) Menefee Formation, northwestern New Mexico. Journal of Vertebrate Paleontology 16:421-431.

Williamson, T. E. and D. J. Chure. 1996. A large allosaurid from the Upper Jurassic Morrison Formation (Brushy Basin Member), west-central New Mexico. Museum of Northern Arizona Bulletin 60:73-79.

Williamson, T. E. and S. G. Lucas. 1996. Mammal footprints from the Miocene-Pliocene Ogallala Formation, eastern New Mexico.  New Mexico Geology 18:1-5

Williamson, T. E., S. G. Lucas, and R. K. Stucky. 1996. Megalesthonyx hopsoni (Mammalia: Tillodontia) from the early Bridgerian (Gardnerbuttean) of the Wind River Formation, northeastern Wind River Basin, Wyoming. Proceedings of the Denver Museum of Natural History 13:1-3.

1995

Lucas, S. G. and Williamson, T. E. 1995. Systematic position and biochronological significance of Yuodon and Palasiodon, supposed Paleocene "condylarths" from China. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen 196:93-107.


1993


Lucas, S. G. and T. E. Williamson. 1993. Late Cretaceous to early Eocene vertebrate biostratigraphy and biochronology of the San Juan Basin, New Mexico.  New Mexico Museum of Natural History and Science, Bulletin 3:93-104.

Lucas, S. G. and T. E. Williamson. 1993. Eocene vertebrate and late Laramide stratigraphy of New Mexico.  New Mexico Museum of Natural History, Bulletin 3:145-158

Lucas, S. G. and T. E. Williamson. 1993. A new taeniodont from the Paleocene of the San Juan Basin, New Mexico and the phylogeny of the Taeniodonta.  Journal of Mammalogy 74:175-179.

Lucas, S. G., T. E. Williamson, and J. Sobus. 1993. Plio-Pleistocene stratigraphy, paleoecology and mammalian biochronology, Tijeras Arroyo, Albuquerque area, New Mexico.  New Mexico Geology 15:1-8, 15.

 Williamson, T. E. 1993. The Beginning of the Age of Mammals in the San Juan Basin:  Biostratigraphy and Evolution of Paleocene Mammals of the Nacimiento Formation.  Ph.D. Dissertation, University of New Mexico, Albuquerque, 473 pp.


1992

Lucas, S. G. and T. E. Williamson. 1992. Supplemental road log 2, from Cuba to Nacimiento Copper Mine. New Mexico Geological Society, Guidebook 43:71.

Lucas, S. G. and T. E. Williamson. 1992. Supplemental road log 3, from Durango, Colorado to Pinyon Mesa and the bluffs south of the San Juan River near Farmington. New Mexico Geological Society, Guidebook 43:73-77. 

Lucas, S. G. and T. E. Williamson. 1992. Fossil mammals and the early Eocene age of the San Jose Formation, San Juan Basin, New Mexico. New Mexico Geological Society, Guidebook 43:311-316.

Lucas, S. G., A. P. Hunt, T. E. Williamson, B. S. Kues and V. T. McLemore. 1992. Third-day road log, from Cuba to La Jara, Regina, Almagre Arroyo, Llaves, Gallina, Arroyo del Agua, Coyote, Youngsville and Abiquiu Dam. New Mexico Geological Society, Guidebook 43:53-63.

Lucas, S. G., B. S. Kues, T. E. Williamson and A. P. Hunt, (eds.). 1992. San Juan Basin IV. New Mexico Geological Society, Guidebook 43, 411 pp.

Lucas, S. G., B. S. Kues, T. E. Williamson, and A. P.Hunt. 1992. Editor's message. New Mexico Geological Society, Guidebook 43:vi.

Lucas, S. G., T. E. Williamson, L. N. Smith, R. Wright-Dunbar, B. Hallett, B. S. Kues, G. Hoffman, A. P. Hunt, D. W. Love, V. T. McLemore and R. F. Hadley. 1992. First-day road log, from Cuba to La Ventana, San Luis, Cabezon, Mesa Portales, Mesa de Cuba and Return to Cuba. New Mexico Geological Society, Guidebook 43:1-32.

Williamson, T. E. and S. G. Lucas. 1992. Meniscotherium (Mammalia, "Condylarthra") from the Paleocene - Eocene of North America.  New Mexico Museum of Natural History and Science, Bulletin 1, 87 pp.

Williamson, T. E. and S. G. Lucas. 1992. Selachian fauna from the Upper Cretaceous (Coniacian) El Vado Sandstone Member of the Mancos Shale, San Juan Basin, New Mexico. New Mexico Geological Society, Guidebook 43:17-20.

Williamson, T. E. and S. G. Lucas. 1992. Vertebrate fauna from the Upper Cretaceous (Campanian) Pictured Cliffs Sandstone, Mesa Portales, New Mexico. New Mexico Geological Society, Guidebook 43:26-29.

Williamson, T. E. and S. G. Lucas. 1992. Stratigraphy and mammalian biostratigraphy of the Paleocene Nacimiento Formation, southern San Juan Basin, New Mexico. New Mexico Geological Society, Guidebook 43:265-296.

Williamson, T. E., L. J. Crossey and S. G. Lucas. 1992. Silcretes of the Paleocene Nacimiento Formation.  New Mexico Geological Society, Guidebook 43:38-42.

Williamson, T. E., S. G. Lucas, A. P. Hunt, L. N. Smith and B. S. Kues. 1992. Second-day road log, from Cuba to Counselor, Lybrook, Nageezi, Barrel Springs, Fossil Forest, Blanco Trading Post and return to Cuba.  New Mexico Geological Society, Guidebook 43:33-52.


1991

Williamson, T. E., S. G. Lucas and J. I. Kirkland. 1991. The Cretaceous Elasmobranch Ptychodus decurrens from North America.  Geobios 24:595-599.


1989

Williamson, T. E., and S. G. Lucas. 1989. Late Cretaceous vertebrates from the Mulatto Tongue of the Mancos Shale, Central New Mexico. New Mexico Journal of Science 30:27-34.

Williamson, T. E., S. G. Lucas and R. Pence. 1989. Selachians from the Hosta Tongue of the Point Lookout Sandstone (Upper Cretaceous: Santonian), Central New Mexico.  New Mexico Geological Society, Guidebook 40:239‑245.

 Williamson, T. E., S. G. Lucas, and L. N. Smith. 1989. Stratigraphy and vertebrate biostratigraphy of the lower Eocene Regina Member, San Jose Formation, Sandoval County, San Juan Basin, New Mexico, 1989 Rocky Mountain Section Meeting, American Association of Petroleum Geologists 73:1179.


1988

Lucas, S. G., B. S. Kues, S. Hayden, B. Allen, K. Kietzky, T. E. Williamson, P. Sealey, and R. Pence. 1988. Cretaceous stratigraphy and biostratigraphy of the Cooke's Range, Luna County, New Mexico.  New Mexico Geological Society, Guidebook, 39:143-167.

Lucas, S. G., T. E. Williamson, and J. Sobus. 1988. Late Pleistocene (Rancholabrean) mammals from the Edith formation, New Mexico.  New Mexico Journal of Science 28:51-58. 

Williamson, T. E. 1988. The Taxonomy, Osteology, Functional Morphology, Taphonomy and Paleobiology of Early Cenozoic Meniscotherium (Mammalia, "Condylarthra"). M.S. Thesis, University of New Mexico, Albuquerque, 319 pp.