CM-1-2 (Brazos River K-T boundary, TX) (Cretaceous of the United States)

Where: Falls County, Texas (31.3° N, 96.9° W: paleocoordinates 36.6° N, 75.4° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: P. quadripunctata nannofossil zone, Corsicana Marl Formation, Late/Upper Maastrichtian (70.6 - 66.0 Ma)

• Discoscaphites iris ammonoid zone - Landman et al., 2004

Environment/lithology: marine; unlithified, shelly/skeletal, gray claystone

• fossiliferous clay (described as a massive gray claystone with evenly dispersed shells in hansen et al. 1987)

Size class: mesofossils

Collection methods: bulk, mechanical,

Primary reference: T. A. Hansen, B. Upshaw, E. G. Kauffman and W. Gose. 1993. Patterns of molluscan extinction and recovery across the Cretaceous-Tertiary boundary in east Texas; report on new outcrops. Cretaceous Research 14:685-706 [A. Miller/K. Layou/M. Uhen]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 5555: authorized by Arnold Miller, entered by Karen Layou on 13.10.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Nuculanida - Nuculanidae
Nuculana sp. Link 1807 pointed nut clam
includes: N. sp. b (4), N. sp. (1)
Nuculana houstoni pointed nut clam
Nuculana corsicana pointed nut clam
 Ostreida - Ostreidae
Ostrea sp., "Ostrea mesenterica" = Lopha mesenterica
Ostrea sp. Linnaeus 1758 oyster
"Ostrea mesenterica" = Lopha mesenterica Morton 1834 oyster
 Pectinida - Entoliidae
Syncyclonema sp. Meek 1864 scallop
 Arcida - Cucullaeidae
"Idonearca sp." = Cucullaea (Idonearca)
"Idonearca sp." = Cucullaea (Idonearca) Conrad 1862 clam
 Arcida - Arcidae
 Poromyida - Cuspidariidae
Cuspidaria sp. Dall 1886 clam
C. sp. b (1), C. sp. (1)
 Cardiida - Mactridae
Cymbophora sp. Gabb 1869 clam
C. sp. b (smooth)
 Pholadida - Corbulidae
Gastropoda
 Neogastropoda - Cancellariidae
Cancellaria sp. Lamarck 1799 snail
 Patellida - Lottiidae
Acmaea ? sp. Eschscholtz 1830 limpet
Cephalopoda
 Ammonitida - Sphenodiscidae
Sphenodiscus ? sp. Meek 1871 ammonite
 Ammonitida - Baculitidae
Baculites sp. Lamarck 1799 ammonite
 Ammonitida - Scaphitidae
Discoscaphites sp. Meek 1870 ammonite
Pisces
  -
"Pisces indet." = Osteichthyes
"Pisces indet." = Osteichthyes Huxley 1880 bony fish
fish scales and bones