CM-1-15 (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

• outcrop-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 III, 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]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 5567: authorized by Arnold Miller, entered by Karen Layou on 15.10.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

 Arcida - Arcidae
 Arcida - Cucullaeidae
"Idonearca sp." = Cucullaea (Idonearca)
"Idonearca sp." = Cucullaea (Idonearca) Conrad 1862 clam
 Pectinida - Entoliidae
Syncyclonema sp. Meek 1864 scallop
 Ostreida - Flemingostreidae
"Ostrea mesenterica" = Lopha mesenterica
"Ostrea mesenterica" = Lopha mesenterica Morton 1834 oyster
 Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758 oyster
 Ostreida - Bakevelliidae
Gervillia ? sp. Defrance 1820 oyster
 Carditida - Carditidae
 Pholadida - Corbulidae
Corbula sp. Bruguière 1789 clam
 Lucinida - Lucinidae
 Protobranchia - Nuculanidae
Nuculana sp. Link 1807 pointed nut clam
 Dentaliida - Dentaliidae
Dentalium leve Stephenson 1923 tusk shell
 Ammonoidea -
 Ammonitida - Scaphitidae
Discoscaphites sp. Meek 1870 ammonite
 Ammonitida - Baculitidae
Baculites sp. Lamarck 1799 ammonite