1. Eubaculites carinatus
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Witts, James D., Landman, Neil H., Garb, Matthew P., Irizarry, Kayla M., Larina, Ekaterina, Thibault, Nicolas, Razmjooei, Mohammad J., Yancey, Thomas E., and Myers, Corinne E.
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Cephalopoda ,Mollusca ,Eubaculites carinatus ,Animalia ,Eubaculites ,Biodiversity ,Baculitidae ,Taxonomy ,Ammonitida - Abstract
Eubaculites carinatus (Morton, 1834) Figure 10A–J, N–S Eubaculites carinatus (Morton, 1834) figs. 29–35 Baculites carinatus Morton, 1834: 44, pl. 13, fig. 1. Baculites lyelli d’Orbigny, 1847: pl. 1, figs. 3–7. Baculites tippaensis Conrad, 1858: 334, pl. 3, fig. 27. Baculites spillmani Conrad, 1858: 335, pl. 35, fig. 24. Baculites sheromingensis Crick, 1924: 139, pl. 9, figs. 1–3. Eubaculites lyelli (d’Orbigny, 1847). Kennedy, 1987: 195, pl. 27, figs. 5–8; pl. 32, figs. 13, 14 (with full synonymy). Eubaculites carinatus (Morton, 1834). Klinger and Kennedy, 1993: 218, text-figs. 7a–e, 21–30, 31a–g, 32– 35, 36e, f, 37, 38, 42a, 52g, h. Eubaculites carinatus (Morton, 1834). Kennedy and Cobban, 2000: 180, pl. 2, figs. 1–23, 27, 28; text figs. 3, 4 (with additional synonymy). Eu baculites carinatus (Morton, 1834). Kennedy et al., 2001: 168, fig. 4a, e. Eubaculites carinatus (Morton, 1834). Landman et al., 2004a: 35, fig. 15P, Q. Eubaculites carinatus (Morton, 1834). Landman et al., 2004b: 55, figs. 27–29, 30A, B, 33U–Y. Eubaculites carinatus (Morton, 1834). Landman et al., 2007a: 64, figs. 29–35. TYPE: The holotype, by monotypy, is ANSP 72866, the original of Morton (1834: pl. 13, fig. 1), from the Maastrichtian Prairie Bluff Chalk of Alabama. MATERIAL: Approximately 40 specimens in the AMNH collections in the top 1 m of the Corsicana Formation at AMNH locs. 3620 and 3621, and as reworked material in the upper portion of the first unit (mudstone-clast-bearing unit) of the overlying K-Pg event deposit at the base of the Kincaid Formation, AMNH loc. 3620. DESCRIPTION: Nearly all the specimens are crushed but bear weak to strong, slightly crescentic nodate swellings on the flanks. The largest specimen is AMNH 108203, which retains part of the body chamber. The whorl height at the broken end of the body chamber is 30.5 mm, suggesting that it is a macroconch. The only fully three-dimensional specimen is AMNH 111960 from the K-Pg event deposit. It is a fragment 58.0 mm long with a whorl height of 30.0 mm at its adoral end. It is completely septate suggesting that it is probably a macroconch. The dorsum is very broadly rounded, and the dorsolateral margin is fairly sharply rounded. The inner flanks are broadly rounded with maximum width at one-third whorl height. The outer flanks converge to a tabulate venter bordered by a shallow longitudinal groove on each side. The flanks bear two prominent nodate swellings and the venter is covered with transverse ribs that project slightly forward, producing a serrated appearance. REMARKS: Several specimens from the Corsicana Formation are associated with oysters and represent postmortem encrustations (fig. 5A, B). The whorl height of the largest specimen in our collection (30.5 mm) exceeds that of the largest specimen of this species at the ageequivalent Tinton Formation in Monmouth County, New Jersey (25.4 mm). However, the specimens in the Corsicana Formation do not approach the size of the largest specimens of this species from Argentina and Zululand, which are approximately 90 mm in whorl height (Klinger and Kennedy, 2001: 62). Our collection is too small to confirm the hypothesis of dimorphism in Eubaculites carinatus, as suggested by bimodal size distributions of specimens from South Africa and South American localities by Klinger and Kennedy (2001). OCCURRENCE: Top 1 m of the Corsicana Formation at AMNH locs. 3620 and 3621, and basal Kincaid Formation at AMNH loc. 3620. We also found specimens of Eubaculites carinatus 17.68–18.29 mbs and 20.12–20.73 mbs in the Mullinax-1 core, correlated to planktonic foraminiferal zone CF3. The species has also been recorded throughout an approximately 11 m succession of the Corsicana Formation at Brazos by Kennedy et al. (2001). This species is widely distributed and, according to Henderson et al. (1992: 153), “is a useful indicator of middle to late Maastrichtian age and represents the last widely distributed heteromorph taxon to appear in the stratigraphic record.” On the eastern Gulf Coastal Plain, it is reported from the Owl Creek Formation in Mississippi, Missouri, and Tennessee (Kennedy and Cobban, 2000) and the Prairie Bluff Chalk in Alabama and Mississippi (Cobban and Kennedy, 1995). On the Atlantic Coastal Plain, it occurs in the Tinton and New Egypt formations, and as reworked material in the Hornerstown Formation in Monmouth and Gloucester counties, New Jersey (Kennedy and Cobban, 1996; Landman et al., 2004b; 2007a) and in the Severn Formation in Prince Georges and Anne Arundel counties, Maryland (Kennedy et al., 1997; Landman et al., 2004). It has also been reported from southeastern and southwestern France, northern Spain, Austria, the Netherlands, Zululand (South Africa), Mozambique, Madagascar, South India, Western Australia, Chile, Argentina, and California (Klinger and Kennedy, 1993; Klinger et al., 2001)., Published as part of Witts, James D., Landman, Neil H., Garb, Matthew P., Irizarry, Kayla M., Larina, Ekaterina, Thibault, Nicolas, Razmjooei, Mohammad J., Yancey, Thomas E. & Myers, Corinne E., 2021, Cephalopods from the Cretaceous-Paleogene (K-Pg) boundary interval on the Brazos River, Texas, and extinction of the ammonites, pp. 1-52 in American Museum Novitates 2021 (3964) on pages 25-27, DOI: 10.1206/3964.1, http://zenodo.org/record/4566589, {"references":["Morton, S. G. 1834. Synopsis of the organic remains of the Cretaceous group of the United States. Illustrated by 19 plates, to which is added an appendix containing a tabular view of the Tertiary fossils hitherto discovered in North America. Philadelphia: Key and Biddle.","Conrad, T. A. 1858. Observations on a group of Cretaceous fossil shells found in Tippah County, Mississippi, with descriptions of 56 new species. Journal of the Academy of Natural Sciences of Philadelphia (Series 2) 3: 275 - 298.","Crick, G. C. 1924. On Upper Cretaceous Cephalopoda from Portugese East Africa. Transactions of the Geological Society of South Africa 26: 130 - 140.","Kennedy, W. J. 1987. The ammonite fauna of the type Maastrichtian with a revision of Ammonites colligatus Binkhorst, 1861. Bulletin de l'Institut Royal des Sciences Naturelles de Belgique 56: 151 - 267.","Klinger, H. C., and W. J. Kennedy. 1993. Cretaceous faunas from Zululand and Natal, South Africa. The heteromorph ammonite genus Eubaculites Spath, 1926. Annals of the South African Museum 102: 185 - 264.","Kennedy, W. J., and W. A. Cobban. 2000. Maastrichtian (Late Cretaceous) ammonites from the Owl Creek Formation in northeastern Mississippi, U. S. A. Acta Geologica Polonica 50: 175 - 190.","Kennedy, W. J., A. S. Gale, and T. A. Hansen. 2001. The last Maastrichtian ammonites from the Brazos River sections in Falls County, Texas. Cretaceous Research 22: 163 - 171.","Landman, N. H., R. O. Johnson, and L. E. Edwards. 2004 a. Cephalopods from the Cretaceous / Tertiary boundary interval on the Atlantic coastal plain, with a description of the highest ammonite zones in North America. Part 1, Maryland and North Carolina. American Museum Novitates 3454: 1 - 64.","Landman, N. H., R. O. Johnson, and L. E. Edwards. 2004 b. Cephalopods from the Cretaceous / Tertiary boundary interval on the Atlantic coastal plain, with a description of the highest ammonite zones in North America. Part 2, Northeastern Monmouth County, New Jersey. Bulletin of the American Museum of Natural History 287: 1 - 107.","Landman, N. H., R. O. Johnson, M. P. Garb, L. E. Edwards, and F. T. Kyte. 2007 a. Cephalopods from the Cretaceous / Tertiary boundary interval on the Atlantic coastal plain, with a description of the highest ammonite zones in North America. Part 3, Manasquan River Basin, Monmouth County, New Jersey. Bulletin of the American Museum of Natural History 303: 1 - 122.","Henderson, R. A., W. J. Kennedy, and K. J. Mcnamara. 1992. Maastrichtian heteromorph ammonites from the Carnarvon Basin, Western Australia. Alcheringa: an Australasian Journal of Palaeontology 16: 133 - 170.","Cobban, W. A., and Kennedy, W. J. 1995. Maastrichtian ammonites chiefly from the Prairie Bluff Chalk in Alabama and Mississippi. Memoir, the Paleontological Society 44: 1 - 40.","Kennedy, W. J., and W. A. Cobban. 1996. Maastrichtian ammonites from the Hornerstown Formation in New Jersey. Journal of Paleontology 70: 798 - 804.","Kennedy, W. J., W. A. Cobban, and N. H. Landman. 1997. Maastrichtian ammonites from the Severn Formation of Maryland. American Museum Novitates 3210: 1 - 30."]}
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- 2021
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