CM-1-1 (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: Prediscosphaera 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 5554: 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 (3), N. sp. d (2), N. sp. e (1), and N. sp. (4)
Nuculana corsicana pointed nut clam
 Mytilida - Mytilidae
"Dreissena tippana" = Cuneolus tippana
"Dreissena tippana" = Cuneolus tippana Conrad 1858 mussel
 Mytilida - Crenellidae
Crenella aff. serica Conrad 1860 clam
 Ostreida - Gryphaeidae
Pycnodonte sp. Fischer von Waldheim 1835 oyster
Gryphaeostrea sp. Conrad 1865 oyster
Gryphaeostrea sp. aff. vomer
 Ostreida - Flemingostreidae
Cubitostrea tecticosta Gabb 1860 oyster
Agerostrea falcata Morton 1827 oyster
 Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758 oyster
Ostrea aff. congesta Conrad 1843 oyster
 Ostreida - Pteriidae
Phelopteria sp. Stephenson 1953 pearl oyster
 Ostreida - Bakevelliidae
"Gervillia ensiformis" = Gervilliopsis ensiformis
"Gervillia ensiformis" = Gervilliopsis ensiformis Conrad 1858 oyster
 Ostreida - Pinnidae
Pinna sp. Linnaeus 1758 oyster
 Pectinida - Anomiidae
Anomia sp. Linnaeus 1758 jingle
Anomia argentaria Morton 1833 jingle
 Pectinida - Entoliidae
Entolium sp. n. sp. Meek 1865 scallop
Syncyclonema sp. Meek 1864 scallop
 Arcida - Cucullaeidae
"Idonearca sp." = Cucullaea (Idonearca)
"Idonearca sp." = Cucullaea (Idonearca) Conrad 1862 clam
 Arcida - Arcidae
 Carditida - Astartidae
 Poromyida - Cuspidariidae
Cuspidaria grovensis Stephenson 1941 clam
 Cardiida - Tellinidae
Tellina sp. n. sp.
Tellina sp. n. sp. Linnaeus 1758 tellin clam
Tellina n sp. aff. munda
 Cardiida - Mactridae
Cymbophora sp. Gabb 1869 clam
includes: C. sp. a (round)(10), C. sp. b (smooth)(1)
 Cardiida - Veneridae
Veneridae indet. Rafinesque 1815 venus clam
 Pholadida - Corbulidae
 Lucinida - Lucinidae
Scaphopoda
 Dentaliida - Dentaliidae
Dentalium leve Stephenson 1923 tusk shell
Gastropoda
 Heterostropha - Ringiculidae
Ringicula sp. Deshayes 1838 snail
 Neotaenioglossa -
Neotaenioglossa indet. Haller 1882 snail
Anchura or amuletum
 Neogastropoda - Fasciolariidae
Bellifusus sp. Stephenson 1941 snail
 Sorbeoconcha - Naticidae
Naticidae indet. Guilding 1834 moon snail
 Epitonioidea - Epitoniidae
Striaticostatum cf. bexarense Stephenson 1941 wentletrap
Cephalopoda
 Ammonitida - Sphenodiscidae
Sphenodiscus ? sp. Meek 1871 ammonite
 Ammonitida - Baculitidae
Baculites sp. Lamarck 1799 ammonite