ACh-1 Rep 4 (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, surface (in situ), 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 86175: 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
Lacunaria sp. Conrad 1866 moon snail
Euspira perspecta moon snail
 Neogastropoda - Volutidae
? Athleta sp., "Volutocorbis rugatus" = Athleta (Volutocorbis)
? Athleta sp. Conrad 1853 volute
"Volutocorbis rugatus" = Athleta (Volutocorbis) volute
 Neogastropoda - Raphitomidae
 Neogastropoda - Fasciolariidae
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
Jupiteria smirna pointed nut clam
 Pectinida - Propeamussiidae
Propeamussium alabamense Aldrich 1886 mud scallop
 Arcida - Cucullaeidae
 Pholadida - Corbulidae
 Cardiida - Cardiidae
Nemocardium sp. Meek 1876 cockle
 Carditida - Carditidae
Venericardia sp. Lamarck 1801 clam
Venericardia wilcoxensis sp.
Scaphopoda
 Gadilida - Gadilidae
Cadulus sp. Philippi 1844 tusk shell
 Dentaliida - Dentaliidae
Anthozoa
 Scleractinia - Oculinidae
Oculina alabamensis Vaughan 1900 stony coral