Thomas E. Williamson

Vertebrate Paleontology, Stratigraphy

Publications - K-PG Boundary and Post-Extinction Ecological Recovery



Publications resulting from this research:

 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.

Pignataro, F., A. Weil, and T. E. Williamson. 2003. New Multituberculate mammals from the Late Cretaceous Kirtland Formation, San Juan Basin, New Mexico. Journal of Vertebrate Paleontology 23:87A (Abstract). 

Weil, A., and Williamson, T. E., 2000, Diverse Maastrichtian terrestrial vertebrate fauna of the Naashoibito Member, Kirtland Formation (San Juan Basin, New Mexico) confirms "Lancian" faunal heterogeneity in western North America: Geological Society of America Abstracts with Programs, p. A-498.

Weil, A. and T. E. Williamson. 2007. Late Cretaceous through earliest Tertiary evolution of multituberculate mammals in the San Juan Basin of New Mexico, and their biogeographic context.” Joint South-Central and North-Central Sections, Geological Society Abstracts with Programs 39:15 (Abstract).

Williamson, T. E. 2008. Early Paleocene mammal succession in the Nacimiento Formation, San Juan Basin, New Mexico. Geological Society of America, Abstracts With Programs, p. 325 (Abstract).

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 Sullivan, R. M., 1998, A new local fauna, the Willow Wash local fauna, from the Upper Cretaceous (Campanian) Kirtland Formation, New Mexico: Journal of Vertebrate Paleontology, v. 18, no. (supp to 3), p. 86A.

Williamson, T. E., and Weil, A., 2001a, Dinosaurs from microvertebrate sites in the upper Cretaceous Fruitland and Kirtland Formations, San Juan Basin, New Mexico: Geological Society of America Abstracts with Programs, v. 33, no. 5, p. A-21.

Williamson, T. E., and Weil, A., 2001b, New microvertebrate localities in the upper Cretaceous Fruitland and Kirtland Formations, San Juan Basin, New Mexico: New Mexico Geology, v. 23, p. 64.

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.

Williamson, T. E., A. Weil and L. Becenti. 2006. First occurrence of Glasbius (Mammalia, Metatheria) in New Mexico and a Lancian age for the Naashoibito Member, Kirtland Formation. Journal of Vertebrate Paleontology 26:139. (Abstract).

Williamson, T. E. 2007. Mammal recovery following the terminal Cretaceous mass extinction. Western Interior Paleontology Society Meeting, Abstract with Programs, p. 55 (Abstract).

Williamson, T. E. 2007. Exceptional preservation of mammals, a bird, and lizards from the lower Paleocene of New Mexico. Journal of Vertebrate Paleontology 27:166A (Abstract).

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.

Williamson, T. E. and D. Nichols. 2007. Paleocene palynomorph assemblages from the Nacimiento Formation, San Juan Basin, New Mexico. New Mexico Geology. 29:63 (Abstract).

Suggested reading:

Archibald, J. D., 1982, A study of Mammalia and geology across the Cretaceous-Tertiary boundary in Garfield County, Montana: University of California Publications in Geological Sciences, v. 122, p. 286.

Baltz, E. H. J., Ash, S. R., and Anderson, R. Y., 1966, History of nomenclature and stratigraphy of rocks adjacent to the Cretaceous-Tertiary boundary, western San Juan Basin, new Mexico: U.S. Geological Survey, 524-D.

Cifelli, R. L., Madsen, S. K., and Larson, E. M., 1996, Screenwashing and associated techniques for the recovery of microvertebrate fossils: Oklahoma Geological Survey Special Publication 96-4, p. 1-24.

Clemens, W. A., 1963, Fossil mammals of the type Lance Formation Wyoming. Part I. Introduction and Multituberculata: University of California Publications in Geological Sciences, v. 48, p. 105.

Cifelli, R. L., J. J. Eberle, et al. (2004). "Mammalian biochronology of the latest Cretaceous."  2004. Mammalian biochronology of the latest Cretaceous. pp. 21–42 in M. O. Woodburne (ed.), Late Cretaceous and Cenozoic mammals of North America: Biostratigraphy and Geochronology, Columbia University Press, New York.

Clemens, W. A., 1966, Fossil mammals of the type Lance Formation Wyoming. Part II. Marsupialia: University of California Publications in Geological Sciences, v. 62, p. 122.

Clemens, W. A., 1973, Fossil mammals of the type Lance Formation Wyoming. Part III. Eutheria and summary: University of California Publications in Geological Sciences, v. 94, p. 102.

Fassett, J. E. (2009a). New geochronologic and stratigraphic evidence confirms the Paleocene age of the dinosaur-bearing Ojo Alamo Sandstone and Animas Formation in the San Juan Basin, New Mexico and Colorado. Palaeontologia Electronica, 12.1: 1-155.

Fassett, J. E. (2009b). Response to critique by Lucas et al. (2009) of paper by Fassett (2009) documenting Paleocene dinosaurs in the San Juan Basin. Palaeontologia Electronica 12.2.10A:1-10.

Fassett, J. E., and Lucas, S. G., 2000, Evidence for Paleocene dinosaurs in the Ojo Alamo Sandstone, San Juan Basin, New Mexico, in Lucas, S. G., and Heckert, A. B., eds., Dinosaurs of New Mexico. New Mexico Museum of Natural History and Science Bulletin No. 17, p. 221-229.

Fassett, J. E., Lucas, S. G., and O'Neill, F. M., 1987, Dinosaurs, pollen and spores, and the age of the Ojo Alamo Sandstone, San Juan Basin, New Mexico, in Fassett, J. E., and Rigby, J. K., Jr., eds., The Cretaceous-Tertiary Boundary in the San Juan and Raton Basins, New Mexico and Colorado: Boulder, Colorado, Geological Society of America, p. 17-34.

Flynn, L. J., 1986, Late Cretaceous mammal horizons from the San Juan Basin, New Mexico: American Museum Novitates, no. 2845, p. 1-30.

Kues, B. S. (2008). The Paleontology of New Mexico. Albuquerque: University of New Mexico Press. 428 pp.

Lehman, T. M., 1984, The multituberculate Essonodon browni from the Upper Cretaceous Naashoibito Member of the Kirtland Shale, San Juan Basin, New Mexico: Journal of Vertebrate Paleontology, v. 4, no. 4, p. 602-603.

Lehman, T. M., 1985, Depositional envrionments of the Naashoibito Member of the Kirtland Shale, Upper Cretaceous, San Juan Basin, New Mexico: New Mexico Bureau of Mines and Mineral Resources Circular, v. 195, p. 55-79.

Lehman, T. M., 1987, Late Maastrichtian paleoenvironments and dinosaur biogeography in the Western Interior of North America: Palaeogeography, Palaeoclimatology, Palaeoecology, v. 60, p. 189-217.

Lehman, T. M., 1997, Late Campanian dinosaur biogeography in the Western Interior of North America, in Wolberg, D., and Stump, E., eds., Dinofest International, Proceedings of a symposium sponsored by Arizona State University: Special Publication: Philadelphia, Academy of Natural Sciences.

Lucas, S. G., Mateer, N. J., Hunt, A. P., and O'Neill, F. M., 1987, Dinosaurs, the age of the Fruitland and Kirtland Formations, and the Cretaceous-Tertiary boundary in the San Juan Basin, New Mexico, in Fassett, J. E., and Rigby, J. K., Jr., eds., The Cretaceous-Tertiary Boundary in the San Juan and Raton Basins, New Mexico and Colorado: Boulder, Colorado, Geological Society of America, p. 35-50.

Lucas, S. G., Sullivan, R. M., Cather, S. M., Jasinski, S. E., Fowler, D. W., Heckert, A. B., et al. (2009). No definitive evidence of Paleocene dinosaurs in the San Juan Basin. Palaeontologica Electronica 12.2.9A:1-10.

Sullivan, R. M., A. Boere, et al. (2005). "Redescription of the ceratopsid dinosaur Torosaurus utahensis (Gilmore, 1946) and a revision of the genus." Journal of Paleontology 79: 577-595.


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