{"references": ["Aitken, R. R., 1983. Commercial natural gas from Fruitland coals, San Juan Basin, New Mexico and Colorado; n Fassett, J. E., ed.. Oil and gas fields of the Four Comers area. Volume 3: Farmington, Four Comers Geological Society, p. 729-733.", "Alvarez, W. and Vann, D. W., 1979, Comment on \" Biostratigraphy and mag - netic polarity stratigraphy of Paleocene terrestrial deposits, San Juan Basin, New Mexico\": Geology, v. 7. p. 66-67.", "Armstrong-Ziegler, J. G.. 1978. An aniliid snake and associated vertebrates from the Campanian of New Mexico: Journal of Paleontology, v. 52, p. 480- 483.", "Armstrong-Ziegler, J. G., 1980, Amphibia and Reptilia from the Campanian of New Mexico: Fieldiana Geology, new series, v. 4, p. 1-39.", "Baltz, E. H. Jr.. 1967. Stratigraphy and regional tectonic implications of part of Upper Cretaceous and Tertiary rocks, east-central San Juan Basin: U.S. Geological Survey. Professional Paper 552. 101 p.", "Baltz, E. H. Jr., 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, Professional Paper 524D, 23 p.", "Bauer. C. M.. 1916, Contributions to the geology and paleontology of San Juan County. New Mexico. 1. Stratigraphy of a part of the Chaco River Valley: U.S. Geological Survey, Professional Paper 98P. p. 271-278.", "Berry, E. W., 1924, The middle and upper Eocene floras of southeastern North America: U.S. Geological Survey, Professional Paper 92, 206 p.", "Brett-Surman, M. K.. 1975. The appendicular anatomy of hadrosaurian dinosaurs [M.S. thesis]: Berkeley, University of California. 70 p.", "Brookins, D. G. and Rigby, J. K. Jr.. 1987. Geochronologie and geochemical study of volcanic ashes from the Kirtland Shale (Cretaceous), San Juan Basin. New Mexico: Geological Society of America, Special Paper, v. 209, p. 105- 110.", "Brown, B., 1910. The Cretaceous Ojo Alamo beds of New Mexico with de - scription of the new dinosaur genus Kritosaurus: Bulletin of the American Museum of Natural History, v. 28, p. 267-274.", "Brown, J. L., 1982, Geologic map of the Alamo Mesa East Quadrangle, San Juan County. New Mexico: U.S. Geological Survey. Miscellaneous Investigations Map MF-1497, scale 1:24,000.", "Bryant, L. J., 1987, A new genus of Amiidae (Holostei; Osteichthyes) from the Late Cretaceous of North America, with comments on the phylogeny of the Amiidae: Journal of Vertebrate Paleontology, v. 7, p. 349-361.", "Bryant, L. J., 1989, Non-dinosaurian vertebrates across the Cretaceous-Tertiary boundary in northeastern Montana: University of California Publications in Geological Sciences, v. 134. 107 p.", "Butler, R. F. and Lindsay, E. H., 1985, Mineralogy of magnetic minerals and revised magnetic polarity stratigraphy of continental sediments. San Juan Basin, New Mexico: Journal of Geology, v. 93. p. 535-554.", "Butler. R. E. Gingerich. P. D. and Lindsay, E. H.. 1980, Magnetic polarity stratigraphy and biostratigraphy of Paleocene and Lower Eocene continental deposits, Clark Fork basin, Wyoming: Journal of Geology, v. 89, p. 299- 316.", "Carpenter. K., 1990, Variation in Tyrannosaurus rex; n Carpenter, K. and Currie, P. J., eds.. Dinosaur systematics perspectives and approaches: Cambridge, Cambridge University Press, p. 141-145.", "Carpenter. K. and Currie. P. J., eds., 1990, Dinosaur systematics: perspectives and approaches: Cambridge. Cambridge University Press, 318 p.", "Chapman, R. E. and Brett-Surman, M. K., 1990, Morphometric observations on hadrosaurid omithopods; n Carpenter, K. and Currie, P. J., eds.. Dinosaur systematics: approaches and perspectives: Cambridge, Cambridge University Press, p. 163-177.", "Clemens, W. A., 1973. The role of fossil vertebrates in interpretation of Late Cretaceous stratigraphy of the San Juan Basin. New Mexico: Four Comers Geological Society Memoir, p. 154-167.", "Cobban, W. A., 1973, Significant ammonite finds in uppermost Mancos Shale and overlying formations between Barker Dome, New Mexico and Grand Junction, Colorado: Four Comers Geological Society Memoir, p. 148-153.", "Cobban, W. A., Landis. E. R. and Dane, C. H., 1973, Age relations of upper part of Lewis Shale on east side of San Juan Basin. New Mexico: New Mexico Geological Society. Guidebook 25, p. 279-282.", "Coombs, W. P. and Maryanska, T., 1990. Ankylosauria; n Weishampel. D. B., Dodson, P. and Osmolska, H. eds.. The Dinosauria: Berkeley, University of California Press, p. 456-483.", "Davies, K. L., 1983, Hadrosaurian dinosaurs of Big Bend National Park. Brewster County. Texas [M.S. thesis]: Austin. University of Texas, 235 p.", "Decourten, F. L. and Russell. D. A.. 1985, A specimen of Ornithomimus velox (Theropoda, Ornithomimidae) from the terminal Cretaceous Kaiparowits For - mation of southern Utah: Journal of Paleontology, v. 59, p. 1091-1099.", "Dilworth, L. O., 1960, Upper Cretaceous Farmington Sandstone of northeastern San Juan County, New Mexico [M.S. thesis]: Albuquerque. University of New Mexico, 96 p.", "Dodson. P. and Currie. P. J., 1990, Neoceratopsia; in Weishampel, D. B., Dodson, P. and Osmolska, H., eds.. The Dinosauria: Berkeley, University of California Press, p. 593-618.", "Eaton, J. G., 1987. The Campanian-Maastrichtian boundary in the Western Interior of North America: Newsletters on Stratigraphy, v. 18. p. 31-39.", "Erpenbeck, M. F, 1979, Stratigraphic relationships and depositional environ - ments of the Upper Cretaceous Pictured Cliffs Sandstone and Fruitland Formation in the southwestern San Juan Basin, New Mexico [M.S. thesis]: Lubbock, Texas Tech University, 78 p.", "Estes, R.. 1964, Fossil vertebrates from the Late Cretaceous Lance Formation, eastern Wyoming: University of California Publications in the Geological Sciences, v. 49, 180 p.", "Fassett, J. E., 1968. Summary of geologic data obtained from borehole GB-1. Project Gasbuggy: New Mexico Geological Society, Guidebook 19, p. 24- 27.", "Fassett, J. E.. ed., 1978, Oil and gas fields of the Four Corners area. Volumes 1 and 2: Farmington, Four Comers Geological Society, 727 p.", "Fassett, J. E., ed., 1983, Oil and gas fields of the Four Comers area. Volume 3: Farmington, Four Comers Geological Society. 420 p.", "Fassett. J. E.. 1987, The ages of the continental. Upper Cretaceous. Fruitland Formation and Kirtland Shale, based on a projection of ammonite zones from the Lewis Shale. San Juan Basin, New Mexico and Colorado: Geological Society of America. Special Paper, v. 209, p. 5-16.", "Fassett. J. E. and Hinds. J. S., 1971, Geology and fuel resources of the Fruitland Formation and Kirtland Shale of the San Juan Basin, New Mexico and Colorado: U.S. Geological Survey. Professional Paper 676, 76 p.", "Flores. R. M. and Erpenbeck, M. F., 1981. Differentiation of delta-front and barrier lithofacies of the Upper Cretaceous Pictured Cliffs Sandstone, south - west San Juan Basin, New Mexico: Mountain Geologist, v. 18, p. 23-34.", "Flynn, L. J., 1986, Late Cretaceous mammal horizons from the San Juan Basin. New Mexico: American Museum Novitates 2845, 30 p.", "Gaffney, E. S.. 1972, The systematics of the North American family Baenidae (Reptilia. Cryptodira): Bulletin of the American Museum of Natural History, v. 147, p. 241-312.", "Gilmore. C. W., 1916, Vertebrate faunas of the Ojo Alamo. Kirtland and Fruit - land formations: U.S. Geological Survey, Professional Paper 98Q. p. 279- 308.", "Gilmore, C. W., 1919, Reptilian faunas of the Torreon. Puerco, and underlying Cretaceous formations of San Juan County, New Mexico: U.S. Geological Survey, Professional Paper 119. 71 p.", "Gilmore, C. W., 1922. A new sauropod dinosaur from the Ojo Alamo Formation of New Mexico: Smithsonian Miscellaneous Collections, v. 72(14). 9 p.", "Gilmore, C. W., 1935. On the Reptilia of the Kirtland Formation of New Mexico, with descriptions of new species of fossil turtles: Proceedings of the U.S. National Museum, v. 83, p. 159-188.", "Hall, J. P. and Wolberg, D. L.. 1989, A new Late Cretaceous (Campanian- Maastrichtian) amiid (Halecomorphi: Actinopterygii) from the Fruitland For - mation, San Juan Basin, New Mexico: Journal of Paleontology, v. 63, p. 108-115.", "Harland, W. B., Armstrong. R. L.. Cox, A. V.. Craig, L. E., Smith. A. G. and Smith. D. G., 1990. A geologic time scale 1989: Cambridge. Cambridge University Press, 263 p.", "Hartman. J. H., 1981, Mollusca from Upper Cretaceous Fruitland and Kirtland Formations, western San Juan Basin, New Mexico: review: American As - sociation of Petroleum Geologists Bulletin, v. 65, p. 560.", "Hay, O. P., 1908, The fossil turtles of North America: Carnegie Institution of Washington Publication, v. 75. 568 p.", "Hay, O. P., 1910, Description of eight new species of fossil turtles from west of the 100th meridian: Proceedings of the U.S. National Museum, v. 38. p. 307-326.", "Hopson, J. A., 1975, The evolution of cranial display structures in hadrosaurian dinosaurs: Paleobiology, v. 1, p. 21-43.", "Homer. J. R.. 1990, Evidence of diphyletic origination of the hadrosaurian (Reptilia: Omithischia) dinosaurs; n Carpenter, K. and Currie, P. J., eds.. Dinosaur systematics: approaches and perspectives: Cambridge, Cambridge University Press, p. 179-187.", "Hunt, A. P., 1984, Stratigraphy, sedimentology, taphonomy and magnetostra - tigraphy of the Fossil Forest area, San Juan County. New Mexico [M.S. thesis]: Socorro, New Mexico Institute of Mining and Technology, 338 p.", "Hunt. A. P.. 1986, \"Bisti member\" of the Kirtland Shale, San Juan Basin, New Mexico: implications for basin development: Geological Society of America, Abstracts with Programs, v. 24, p. 26-27.", "Hunt. A. P., 1991, Integrated vertebrate, invertebrate and plant taphonomy of the Fossil Forest area (Fruitland and Kirtland Formations: Late Cretaceous), San Juan County, New Mexico. USA: Palaeogeography, Palaeoclimatology, Palaeoecology, v. 88, p. 85-107.", "Hunt, A. R, 1992, Sedimentology of a fossiliferous fluvial system, Fruitland and Kirtland Formations (Late Cretaceous), Fossil Forest area. San Juan County. New Mexico: New Mexico Geological Soceity, Guidebook 43.", "Hunt. A. P. and Lucas, S. G., 1983, Deltaic sedimentation and major accumulations of fossil vertebrates in the Upper Cretaceous of northern New Mexico: New Mexico Journal of Science, v. 23, p. 20.", "Hunt, A. P. and Lucas, S. G., 1991, An associated Maastrichtian hadrosaur and a Turanian ammonite from the Naashoibito Member, Kirtland Formation (Late Cretaceous: Maastrichtian), northwestern New Mexico: New Mexico Journal of Science, v. 31, p. 27-35.", "Hunt, A. R, Lucas. S. G. and Mateer, N. J., 1992, Charles H. Sternberg and the collection of fossil vertebrates from the Late Cretaceous of the San Juan Basin, New Mexico: New Mexico Geological Society. Guidebook 43.", "Hutchinson, P. J. and Kues, B. S., 1985, Depositional environments and paleontology of Lewis Shale to lower Kirtland Shale sequence (Upper Cretaceous). Bisti area, northwestern New Mexico: New Mexico Bureau of Mines and Mineral Resources, Circular 195, p. 25-54.", "Klute, M. A., 1986, Sedimentology and sandstone petrography of the upper Kirtland Shale and Ojo Alamo Sandstone, Cretaceous-Tertiary boundary, western and southern San Juan Basin. New Mexico: American Journal of Science, v. 286, p. 463-488.", "Knowlton, F. H., 1916, Flora of the Fruitland and Kirtland formations: U.S. Geological Survey, Professional Paper 98. p. 327-333.", "Kues, B. S., 1983, Bryozoan and crustacean from Fruitland Formation (Upper Cretaceous) of New Mexico: New Mexico Geology, v. 5. p. 52-55, 68.", "Kues, B. S., Froehlich, J. W., Schiebout, J. A. and Lucas, S. G.. 1977, Paleontological survey, resource assessment and mitigation plan for the Bisti- Star Lake area, northwestern New Mexico: Unpublished Report to U.S. Bu - reau of Land Management, Albuquerque, 1525 p.", "Lee, W. T., 1917, Geology of the Raton Mesa and other regions in Colorado and New Mexico: U.S. Geological Survey, Professional Paper 101. p. 9- 221.", "Lehman. T. M., 1981, The Alamo wash local fauna: a new look at the old Ojo Alamo fauna; n Lucas, S. G., Rigby, J. K. Jr. and Kues, B. S., eds.. Advances in San Juan Basin paleontology: Albuquerque. University of New Mexico Press, p. 189-221.", "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, p. 602-603.", "Lehman, T. M., 1985, Depositional environments of the Naashoibito Member of the Kirtland Shale, Upper Cretaceous, San Juan Basin, New Mexico: New Mexico Bureau of Mines and Mineral Resources, Circular 195, p. 55-79.", "Lehman. T. M., 1987, Late Maastrichtian paleoenvironments and dinosaur bio - geography in the Western Interior of North America: Palaeogeography. Pa - laeoclimatology, Palacoecology, v. 60, p. 189-217.", "Lehman, T. M. and Carpenter, K., 1990, A partial skeleton of the tyrannosaurid dinosaur Aublysodon from the Upper Cretaceous of New Mexico: Journal of Paleontology, v. 64, p. 1026-1032.", "Leidy, J., 1858, Hadrosaurus foulki, a new saurian from the Cretaceous of New Jersey: Proceedings of the Academy of Natural Sciences. Philadelphia, v. 10. p. 215-218.", "Lillegraven, J. A. and McKenna, M. C.. 1986, Fossil mammals from the \"Mesaverde\" Formation (Late Cretaceous. Judithian) of the Bighorn and Wind River Basins, Wyoming, with definitions of Late Cretaceous North American Land-Mammal \"Ages\": American Museum Notitates 2840, 68 p.", "Lindsay, E. H., Butler. R. F. and Johnson, N. M., 1981, Magnetic polarity zonation and biostratigraphy of Late Cretaceous and Paleocene continental deposits. San Juan Basin, New Mexico: American Journal of Science, v. 281, p. 390-435.", "Lull, R. S. and Wright, N. E., 1942, Hadrosaurian dinosaurs of North America: Geological Society of America, Special Paper 40, 242 p.", "Lucas, S. G., 1981, Dinosaur communities of the San Juan Basin: a case for lateral variation in the composition of Late Cretaceous dinosaur communities; n Lucas, S. G., Rigby, J. K. Jr. and Kues, B S., eds., Advances in San Juan Basin paleontology: Albuquerque, University of New Mexico Press, p. 337-393.", "Lucas, S. G., 1989, Vertebrate biochronology of the Cretaceous-Tertiary bound- ary. San Juan Basin, New Mexico: 28th International Geological Congress Field Guidebook T120, p. 47-51.", "Lucas, S. G., 1991. Dinosaurs and Mesozoic biochronology: Modern Geology, v. 16, p. 127-138.", "Lucas, S. G., 1992. Cretaceous-Eocene crocodilians from the San Juan Basin. New Mexico: New Mexico Geological Society, Guidebook 43.", "Lucas. S. G. and Schoch. R. M.. 1982, Discussion of magnetic polarity zonation and biostratigraphy of Late Cretaceous and Paleocene continental deposits. San Juan Basin, New Mexico: American Journal of Science, v. 282, p. 920- 927.", "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: Geological Society of America, Special Paper 209, p. 35-50.", "Mateer, N. J., 1981, The reptilian megafauna from the Kirtland Shale (Late Cretaceous) of the San Juan Basin, New Mexico; n Lucas. S. G., Rigby, J. K. Jr. and Kues, B. S., eds.. Advances in San Juan Basin paleontology: Albuquerque, University of New Mexico Press, p. 49-75.", "Molnar. R. E.. Kurzanov, S. M. and Dong. Z., 1990, Camosauria; n Weis - hampel, D. B., Dodson, P. and Osmolska. H., eds., The Dinosauria: Berkeley, University of California Press, p. 169- 209.", "Newman, K. R., 1987, Biostratigraphic correlation of Cretaceous-Tertiary boundary rocks, Colorado to San Juan Basin, New Mexico: Geological Society of America. Special Paper 209, p. 151-164.", "Osborn. H. E, 1923, A new genus and species of Ceratopsia from New Mexico, Pentaceratops sternbergii: American Museum Novitates 93. 3 p.", "Ostrom, J. H., 1961, A new species of hadrosaurian dinosaur from the Cretaceous of New Mexico: Journal of Paleontology, v. 35, p. 575-577.", "Ostrom, J. H., 1963, Parasaurolophus cyrtocristatus, a crested hadrosaurian dinosaur from New Mexico: Fieldiana Geology, v. 14, p. 143-168.", "Ostrom, J. H. and Wellnofer, P.. 1990, Triceratops: an example of flawed systematics; n Carpenter, K. and Currie. P. J., eds., Dinosaur systematics: perspectives and approaches: Cambridge, Cambridge University Press, p. 245-254.", "O'Sullivan, R. B., Repenning, C. A., Beaumont, E. C. and Page, M. G., 1972, Stratigraphy of the Cretaceous rocks and the Tertiary Ojo Alamo Sandstone, Navajo and Hopi Indian Reservations. Arizona, New Mexico, and Utah: U.S. Geological Survey. Professional Paper 521E, 65 p.", "O'Sullivan, R. B., Scott, G. R. and Heller, J. S., 1979, Preliminary geologic map of the Bisti Trading Post Quadrangle. San Juan County, New Mexico: U.S. Geological Survey, Miscellaneous Investigations Map MF-1075, scale 1:24,000.", "Parker, L. R., 1978, The paleoecology of the fluvial coal-forming swamps and associated floodplain environments in the Blackhawk Formation (Upper Cre - taceous) of central Utah: Brigham Young University, Geological Studies, v. 22, p. 99-116.", "Parks, W. A., 1920, The osteology of the trachodont dinosaur, Kritosaurus incurvimanus: University of Toronto Studies (Geological Series), v. 11, p. 1-74.", "Paul, G. S., 1988. Predatory dinosarus of the world: New York. Simon and Schuster, 464 p.", "Powell. J. S., 1973. Paleontology and sedimentation models of the Kimbeto Member of the Ojo Alamo Sandstone: Four Comers Geological Society Memoir, p. 111-122.", "Reeside, J. B. Jr., 1924, Upper Cretaceous and Tertiary formations of the western part of the San Juan basin of Colorado and New Mexico: U.S. Geological Survey, Professional Paper 134. 70 p.", "Rigby, J. K. Jr. and Wolberg, D. L., 1987, The therian mammalian fauna (Campanian) of quarry 1, Fossil Forest study area, San Juan Basin, New Mexico: Geological Society of America. Special Paper 209, p. 51-79.", "Riggs, E. A., 1983, Crouch Mesa Fruitland; in Fassett. J. E., ed., Oil and gas fields of the Four Comers area. Volume 3: Farmington, Four Comers Geological Society, p. 951.", "Robison. C. R., Hunt, A. P. and Wolberg. D. L., 1982. New Late Cretaceous leaf locality from the lower Kirtland shale member. Bisti area. San Juan Basin. New Mexico: New Mexico Geology, v. 4, p. 42-45, 48.", "Rowe. T. E., Colbert. E. H. and Nations, J. D., 1981, The occurrence of Pentaceratops (Ornithischia: Ceratopsia) with a description of its frill; in Lucas, S. G., Rigby, J. K. Jr. and Kues, B. S., eds., Advances in San Juan Basin paleontology: Albuquerque, University of New Mexico Press, p. 29- 48.", "Russell, L. S., 1964, Cretaceous non-marine faunas of northwestern North America: Royal Ontario Museum, Life Sciences Contribution 61, 24 p.", "Russell, L. S., 1975, Mammalian faunal succession in the Cretaceous System of western North America: Geological Association of Canada, Special Paper 13, p. 137-161.", "Sahni, A., 1972, The vertebrate fauna of the Judith River Formation. Montana: Bulletin of the American Museum of Natural History, v. 147, p. 323-412.", "Silver. C., 1951. Cretaceous stratigraphy of the San Juan Basin: New Mexico Geological Society. Guidebook 2. p. 104-118.", "Scott. G. R., O'Sullivan. R. B. and Mytton. J. W., 1979. Reconnaissance geologic map of the Alamo Mesa West Quadrangle. New Mexico: U.S. Geological Survey. Miscellaneous Investigations Map MF-1074. scale 1:24.000.", "Stanton. T. W., 1916. Nonmarine Cretaceous invertebrates of the San Juan Basin: U.S. Geological Survey. Professional Paper 98, p. 309-326.", "Tidwell. W. D., Ash, S. R. and Parker, L. R., 1981. Cretaceous and Tertiary floras of the San Juan basin; in Lucas, S. G., Rigby, J. K Jr. and Kues. B. S., eds., Advances in San Juan Basin paleontology: Albuquerque. Uni - versity of New Mexico Press, p. 307-322.", "Tschudy. R.

Hunt, A.P., Lucas, S.G. (1992): Stratigraphy, paleontology and age of the Fruitland and Kirtland Formations (upper Cretaceous), San Juan Basin, New Mexico. In: Lucas, S.G., Kues, B.S., Williamson, T.E., Hunt, A.P. (Eds): New Mexico Geological Society. New Mexico Geological Society 43rd Annual Fall Field Conference Guidebook: 217-239, DOI: http://doi.org/10.5281/zenodo.3614972