CM-1-5 (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 5558: authorized by Arnold Miller, entered by Karen Layou on 14.10.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Arcida - Arcidae
 Arcida - Parallelodontidae
Nemodon navarroanus clam
Nemodon grandis navarroanus
Nemodon eufaulensis clam
[entered as Nemodon eufalensis]
 Myalinida - Inoceramidae
Inoceramus sp. Sowerby 1814 clam
 Pectinida -
Entolium sp. n. sp.
Entolium sp. n. sp. Meek 1865 scallop
 Ostreida - Flemingostreidae
"Ostrea mesenterica" = Lopha mesenterica, Ostrea aff. plumosa
"Ostrea mesenterica" = Lopha mesenterica Morton 1834 oyster
Ostrea aff. plumosa Morton 1833 oyster
 Ostreida - Ostreidae
Cubitostrea tecticosta Gabb 1860 oyster
Ostrea sp. Linnaeus 1758 oyster
 Mytilida - Mytilidae
Volsella sp. Scopoli 1777 mussel
 Carditida - Astartidae
Astarte sp. Sowerby 1816 clam
 Pholadida - Corbulidae
Corbula sp. Bruguière 1789 clam
 Cardiida - Mactridae
Cymbophora sp. Gabb 1868 clam
 Cardiida - Cardiidae
Cardiidae indet. Lamarck 1809 cockle
 Pandorida - Laternulidae
Laternula ? sp. Röding 1798 clam
Anatimya sp. Conrad 1860 clam
 Poromyida - Cuspidariidae
Cuspidaria sp. Dall 1886 clam
C. sp b
Cuspidaria grovensis Stephenson 1941 clam
 Protobranchia - Nuculanidae
Nuculana sp. Link 1807 pointed nut clam
N. sp. b (1), N. sp. d (2), N. sp. e (2), N. sp. (6)
Nuculana houstoni pointed nut clam
Gastropoda
 Neogastropoda - Cancellariidae
Cancellaria sp. Lamarck 1799 snail
Scaphopoda
 Dentaliida - Dentaliidae
Dentalium leve Stephenson 1923 tusk shell
Cephalopoda
 Ammonitida - Sphenodiscidae
Sphenodiscus ? sp. Meek 1871 ammonite
 Ammonitida - Scaphitidae
Discoscaphites sp. Meek 1870 ammonite
Pisces
  -
"Pisces indet." = Osteichthyes
"Pisces indet." = Osteichthyes Huxley 1880 bony fish