Crow Creek (Eocene of the United States)

Where: Saint Francis County, Arkansas (35.0° N, 90.7° W: paleocoordinates 35.8° N, 82.6° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Jackson Group, Priabonian (38.0 - 33.9 Ma)

• "broad correlation between the Crow Creek fauna and Uintan to Chadronian faunas in the continental interior", apparently from a bed < 1 m thick

•AEO estimate of 44.5 - 44.4 Ma (Lutetian) significantly conflicts with marine mammal biochronology

•Priabonian age after Weems et al 2004 (ref. 18945).

• group of beds-level stratigraphic resolution

Environment/lithology: estuary or bay; shelly/skeletal, gray, argillaceous, silty marl

• "intertidal conditions... coastal stream influences... hyposaline... estuarine"
• "silty to sandy marl that appears dark gray in fresh exposures and reddish-brown when weathered. Invertebrate remains often occur in excess of 50% of the sediment volume. Small percentages of clay are present."

Size classes: macrofossils, mesofossils

Collection methods: bulk, sieve,

Primary reference: K.V.W. Palmer. 1939. Basilosaurus in Arkansas. Bulletin of the American Association of Petroleum Geologists 23(8):1128-1129 [M. Uhen/M. Uhen/M. Uhen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 16549: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Mark Uhen

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Ostreida - Ostreidae
 Mytilida - Mytilidae
 Carditida - Carditidae
"Venericardia planicosta" = Venericor planicosta6
"Venericardia planicosta" = Venericor planicosta6 Lamarck 1801 clam
Gastropoda
 Sorbeoconcha - Thiaridae
Chondrichthyes
 Myliobatiformes - Dasyatidae
Dasyatis sp.6 Rafinesque 1810 whiptail stingray
 Myliobatiformes - Myliobatidae
Myliobatis sp.4 Cuvier 1816 eagle ray
 Pristiformes - Pristidae
Pristis sp.4 Linck 1790 sawfish
Propristis schweinfurthi6 Priem 1897 sawfish
 Lamniformes - Odontaspididae
Carcharias hopei6 sand shark
 Orectolobiformes - Ginglymostomatidae
"Ginglymostoma serra" = Nebrius serra6
"Ginglymostoma serra" = Nebrius serra6 Leidy 1877 nurse shark
 Carchariniformes - Carcharhinidae
Abdounia enniskilleni6 requiem shark
Galeocerdo latidens6 Agassiz 1843 tiger shark
"Negaprion gibbesi" = Carcharhinus gibbesi4 Woodward 1889 requiem shark
 Carchariniformes - Hemigaleidae
Hemipristis curvatus6 Dames 1883 ground shark
 Carchariniformes - Triakidae
Galeorhinus sp.6 de Blainville and Prévost 1816 school shark
Actinopteri
 Acanthomorphata - Sphyraenidae
Sphyraena sp.4 Walbaum 1792 barracuda
 Scombriformes - Trichiuridae
Trichiurus sp.4 Linnaeus 1758
 Perciformes -
Diaphyodus wilsoni5 perch-like fish
 Siluriformes - Ariidae
cf. Arius sp.4 Cuvier and Valenciennes 1840 Ariid catfish
 Lepisosteiformes - Lepisosteidae
Lepisosteus sp.4 Agassiz 1843 gar
Reptilia
 Testudines - Trionychidae
Trionychidae indet.2 Gray 1825 softshell turtle
 Loricata -
Crocodylia indet.2 crocodilian
 Squamata - Palaeophidae
Pterosphenus schucherti4 Lucas 1898 squamates
Mammalia
 Cimolesta - Pantolestidae
cf. Pantolestes natans7 Matthew 1909 eutherian
 Ungulata - Agriochoeridae
"cf. Agriochoerus matthewi" = Diplobunops matthewi1
"cf. Agriochoerus matthewi" = Diplobunops matthewi1 Peterson 1919 agriochoerid
 Pelagiceti - Basilosauridae
Basilosauridae indet.3 Cope 1867 whale
Basilosaurus cetoides Owen 1839 whale