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Cephalopods from the Cretaceous-Paleogene (K-Pg) boundary interval on the Brazos River, Texas, and extinction of the ammonites (American Museum novitates, no. 3964)

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dc.contributor.author Witts, James D.
dc.contributor.author Landman, Neil H.
dc.contributor.author Garb, Matthew P.
dc.contributor.author Irizarry, Kayla M.
dc.contributor.author Larina, Ekaterina
dc.contributor.author Thibault, Nicolas
dc.contributor.author Razmjooei, Mohammed J.
dc.contributor.author Yancey, Thomas E.
dc.contributor.author Myers, Corinne E.
dc.date.accessioned 2021-01-13T21:36:29Z
dc.date.available 2021-01-13T21:36:29Z
dc.date.issued 2021-01-13
dc.identifier.issn 0003-0082
dc.identifier.uri http://digitallibrary.amnh.org/handle/2246/7250
dc.description 52 pages : illustrations (some color), map ; 26 cm. en_US
dc.description.abstract We report on new collections of cephalopods (ammonites and nautilids) from the Cretaceous-Paleogene (K-Pg) successions of the Corsicana and Kincaid formations exposed along the Brazos River in Falls County, Texas. An abundant fauna of eight species comprising four genera of ammonites is described from the Corsicana Formation, including Discoscaphites mullinaxorum n. sp. The presence of abundant aptychi (probably lower jaws) of Discoscaphites and Eubaculites, as well as juvenile specimens, indicates a living population that experienced little postmortem drift. The lytoceratid genus Gaudryceras is also reported for the first time from the Brazos River area. Presence of the index taxon Discoscaphites iris (Conrad, 1858) indicates that the fauna belongs to the D. iris Range Zone, the highest ammonite range zone in North America. Correlation with new and existing microfossil data indicates that the fauna represents the uppermost Maastrichtian, and comparison with published records further suggests that this is the most diverse D. iris Zone fauna yet reported from the Gulf and Atlantic Coastal Plains of North America. Three ammonite genera are recorded from the basal units of the K-Pg event deposit at Brazos, which likely represents deposition in the immediate aftermath of the Chicxulub impact event. A single specimen of the nautilid Eutrephoceras is reported from the Danian Kincaid Formation, less than 300 kyr after the K-Pg boundary. These data provide new information on the differing fate of these cephalopod groups during the K-Pg mass extinction and add to the picture of diverse and abundant Maastrichtian ammonite faunas prior to the Chicxulub impact event. en_US
dc.language.iso en_US en_US
dc.publisher American Museum of Natural History. en_US
dc.relation.ispartofseries American Museum novitates;no.3964
dc.subject Ammonoidea -- Texas -- Brazos River Valley. en_US
dc.subject Cephalopoda, Fossil -- Texas -- Brazos River Valley. en_US
dc.subject Mollusks, Fossil -- Texas -- Brazos River Valley. en_US
dc.subject Cretaceous-Paleogene Extinction -- Texas -- Brazos River Valley. en_US
dc.subject Paleontology -- Texas -- Brazos River Valley -- Cretaceous. en_US
dc.title Cephalopods from the Cretaceous-Paleogene (K-Pg) boundary interval on the Brazos River, Texas, and extinction of the ammonites (American Museum novitates, no. 3964) en_US


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  • American Museum Novitates
    Novitates (Latin for "new acquaintances"), published continuously and numbered consecutively since 1921, are short papers that contain descriptions of new forms and reports in zoology, paleontology, and geology. New numbers are published at irregular intervals.

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