CM-1-4 (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, 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 5557: authorized by Arnold Miller, entered by Karen Layou on 13.10.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Pisces
  -
"Pisces indet." = Osteichthyes
"Pisces indet." = Osteichthyes Huxley 1880 bony fish
fish scale, bone
Cephalopoda
 Ammonitida - Baculitidae
Baculites sp.
Baculites sp. Lamarck 1799 ammonite
Gastropoda
 Basommatophora - Siphonariidae
Anisomyon sp.
Anisomyon sp. Meek and Hayden 1860 pulmonate
 Patellida - Lottiidae
Acmaea ? sp.
Acmaea ? sp. Eschscholtz 1830 limpet
 Sorbeoconcha - Naticidae
Naticidae indet., Gyrodes ? sp.
Naticidae indet. Guilding 1834 moon snail
Gyrodes ? sp. Conrad 1860 moon snail
 Neogastropoda - Fasciolariidae
Bellifusus aff. coronatus
Scaphopoda
 Dentaliida - Dentaliidae
Dentalium leve
Dentalium leve Stephenson 1923 tusk shell
Bivalvia
 Nuculanida - Malletiidae
Malletia longifrons
 Nuculanida - Nuculanidae
Nuculana sp., Nuculana houstoni
Nuculana sp. Link 1807 pointed nut clam
includes: N. sp. d (1), N. sp. e (2), N. sp. (8)
Nuculana houstoni pointed nut clam
 Arcida - Cucullaeidae
"Idonearca sp." = Cucullaea (Idonearca)
"Idonearca sp." = Cucullaea (Idonearca) Conrad 1862 clam
 Arcida - Arcidae
Striarca webbervillensis
 Ostreida - Gryphaeidae
Pycnodonte sp.
Pycnodonte sp. Fischer von Waldheim 1835 oyster
 Ostreida - Ostreidae
Ostrea sp., "Ostrea mesenterica" = Lopha mesenterica
Ostrea sp. Linnaeus 1758 oyster
"Ostrea mesenterica" = Lopha mesenterica Morton 1834 oyster
 Ostreida - Bakevelliidae
"Gervillia ensiformis" = Gervilliopsis ensiformis
"Gervillia ensiformis" = Gervilliopsis ensiformis Conrad 1858 oyster
 Mytilida - Mytilidae
Volsella sp.
Volsella sp. Scopoli 1777 mussel
 Pholadida - Corbulidae
Corbula ? williardi, Corbula sp.
Corbula sp. Bruguière 1789 clam
C. sp. a (1), C. sp. (3)
 Cardiida - Mactridae
Cymbophora ? subtilis, Cymbophora cancellosa
 Cardiida - Tellinidae
Tellina sp.
Tellina sp. Linnaeus 1758 tellin clam
 Poromyida - Poromyidae
Liopistha ? sp.
Liopistha ? sp. Meek 1864 clam
 Poromyida - Cuspidariidae
Cuspidaria aff. grandis
Cuspidaria aff. grandis Stephenson 1941 clam