ACh-1 Rep 1 (Paleocene of the United States)

Where: Choctaw County, Alabama (32.2° N, 88.0° W: paleocoordinates 35.0° N, 69.8° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Matthews Landing Marl Member (Porters Creek Formation), Selandian (61.6 - 59.2 Ma)

• Replicates 1, 3 and 4 are from same replicate collecting area, bulk 2 is 9.2m from them.

• bed-level stratigraphic resolution

Environment/lithology: shallow subtidal; poorly lithified, coarse-grained, concretionary, glauconitic, gray, green, calcareous sandstone and unlithified, gray claystone

• poorly lithified medium to coarse grained glauconitic calcareous sand, greenish grey, contains concretions. pockets of gray clay infill some of the more lithified portions.

Size class: mesofossils

Collection methods: bulk, sieve,

• Gastropod shells were only counted if they contained the apex of the shell; bivalves shells were only counted if they contained the umbo.

Primary reference: J. A. Sessa, M. E. Patzkowsky, and T. J. Bralower. 2009. Impact of lithification on the diversity, size distribution, and recovery dynamics of marine invertebrate assemblages. Geology 37(2):115-118 [M. Patzkowsky/J. Sessa/J. Sessa]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 86172: authorized by Mark Patzkowsky, entered by Jocelyn Sessa on 26.01.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

Gastropoda
 Opisthobranchia - Retusidae
Retusa sp. Brown 1827 snail
 Sorbeoconcha - Naticidae
Polinices onustus moon snail
Natica reversa moon snail
 Neogastropoda - Muricidae
Eupleura morula murex snail
 Neogastropoda - Volutidae
? Athleta sp. Conrad 1853 volute
 Neogastropoda - Raphitomidae
 Neogastropoda - Olivellidae
 Neogastropoda - Fasciolariidae
 Neogastropoda - Ptychatractidae
Exilia pergracilis Conrad 1860 snail
 Cerithioidea - Turritellidae
"Turritella alabamiensis" = Mesalia alabamiensis, Turritella "sp. A"
"Turritella alabamiensis" = Mesalia alabamiensis De Gregorio 1890 turret shell
Turritella "sp. A" Lamarck 1799 turret shell
 Lepetellida - Lepetellidae
? Sablea sp. Allen 1970 snail
Bivalvia
 Nuculida - Nuculidae
"Nucula mediavia" = Nucula (Nucula) mediavia
"Nucula mediavia" = Nucula (Nucula) mediavia Harris 1896 nut clam
 Nuculanida - Nuculanidae
Saccella quercollis Harris 1896 pointed nut clam
 Pectinida - Propeamussiidae
Propeamussium alabamense Aldrich 1886 mud scallop
 Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758 oyster
 Arcida - Cucullaeidae
 Arcida - Glycymerididae
Glycymeris sp. Da Costa 1778 clam
 Thraciida - Periplomatidae
Periploma sp. Schumacher 1816 clam
 Pholadida - Corbulidae
 Cardiida - Cardiidae
Nemocardium sp. Meek 1876 cockle
 Carditida - Carditidae
Venericardia sp. Lamarck 1801 clam
Venericardia wilcoxensis sp.
Scaphopoda
 Dentaliida - Dentaliidae