MGS Loc. 97 - Brandon [Mint Spring Fm] (Oligocene of the United States)

Where: Rankin County, Mississippi (32.3° N, 90.0° W: paleocoordinates 32.6° N, 83.5° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Mint Spring Formation, Rupelian (33.9 - 28.1 Ma)

• The Mint Spring Formation consists of fossiliferous sands that lie disconformably above the estuarine clays and sands of the Forest Hill Formation. This contact is characterized by shell gravels that are largely comprised of the bivalve "Callista", by lithified clay clasts bored by the bivalve "Jouannetia", and by shark and ray teeth. Lithified clay clasts are especially common at the base of the Mint Spring Formation along the Chickasawhay River in Wayne County. Here clay clasts are numerous enough to form a cobble bottom on the Mint Spring sea floor. These clasts formed a hard substrate utilized by a variety of encrusting organisms. The sands of the Mint Spring Formation are moderately clean and often show cross-bedding. These sands indicate a near-shore shelf enviroment and have macrofauna dominated by bivalves.

• formation-level stratigraphic resolution

Environment/lithology: offshore; lithified, conglomeratic, calcareous conglomerate and wackestone

Size class: mesofossils

Preservation: original aragonite, original calcite

Collection methods: bulk, mechanical,

• bivalves only.

Primary reference: D. T. Dockery. 1982. Lower Oligocene Bivalvia of the Vicksburg Group in Mississippi. Mississippi Department of Natural Resources Bureau of Geology 123:1-261 [L. Ivany/S. DeLong/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 5942: authorized by Linda Ivany, entered by Sarah DeLong on 01.01.2000

Creative Commons license: CC BY (attribution)

Taxonomic list

• the taxonomic list uses catigories to describe the abundances of the valves. For example: R = rare, 1-9 valves collected. C = common, 10-99 valves collected. A = abundant, 100+ valves collected.

•Categories are listed in the comments field, absolute abundances are given in the abundance field.

•Since taxa with greater than 99 specimens were not counted with absolute abundances, these were reported with category "A" for abundant.

Amonia microstriata n. sp.
R category
 Carditida - Astartidae
Astarte menthifontis n. sp. Dockery 1982 clam
R category
 Carditida - Carditidae
"Venericardia carsonensis" = Venericardia (Rotundicardia) carsonensis
"Venericardia carsonensis" = Venericardia (Rotundicardia) carsonensis Dall 1903 clam
R category
 Thraciida - Thraciidae
Thracia vicksburgiana clam
R category
 Cardiida - Veneridae
Pitar calcanea venus clam
R category
Pitar protena n. sp. venus clam
R category
"Chione victoria" = Lirophora (Lirophora) victoria Dall 1982 venus clam
R category
Callista sobrina venus clam
C category
 Cardiida - Trapezidae
Coralliophaga corrugata n. sp. clam
R category
 Cardiida - Mactridae
Spisula inaequilateralis clam
R category
 Cardiida - Tellinidae
Tellina subprotexta n. sp. tellin clam
R category
 Cardiida - Donacidae
Donax funerata Conrad 1848 clam
R category
 Cardiida - Semelidae
Semele mississippiensis clam
R category
 Cardiida - Cardiidae
Trachycardium planicostata n. sp. Dockery 1982 cockle
R category
Laevicardium leptorimum n. sp. Dockery 1982 cockle
R category
 Pholadida - Corbulidae
"Corbula laqueata" = Varicorbula laqueata, Tiza alta
"Corbula laqueata" = Varicorbula laqueata Casey 1903 clam
R category
Tiza alta clam
R category
 Lucinida - Lucinidae
Myrtea vicksburgensis Casey 1903 clam
R category
Lucina varisculpta n. sp. Dockery 1982 clam
R category
Lucina fimbripallium n. sp. Dockery 1982 clam
C category
Lucina imbricolamella n. sp. Dockery 1982 clam
R category
"Divaricella subrigaultiana" = Divaricella (Divalinga) subrigaultiana Meyer 1886 clam
R category
Anodontia mississippiensis Conrad 1848 clam
R category
 Arcida - Glycymerididae
Glycymeris suwannensis Mansfield 1937 clam
R category
Glycymeris arctata Conrad 1848 clam
R category
 Arcida - Arcidae
Scapharca delicatula Casey 1903 clam
R category
"Barbatia mississippiensis" = Barbatia (Cucullaearca) mississippiensis Conrad 1848 clam
R category
 Pectinida - Pectinoidae
"Pecten poulsoni" = Pecten (Pecten) poulsoni, "Spondylus filiaris" = Spondylus (Spondylus) filiaris
"Pecten poulsoni" = Pecten (Pecten) poulsoni Morton 1834 scallop
C category
"Spondylus filiaris" = Spondylus (Spondylus) filiaris Dall 1916 scallop
R category
 Ostreida - Ostreidae
Ostrea paroxis Lesueur 1829 oyster
C category
 Ostreida - Pteriidae
Pteria argentea Conrad 1848 pearl oyster
R category
 Mytilida - Mytilidae
Arcoperna linteata n. sp. Dockery 1982 mussel
R category
 Nuculida - Nuculidae
Nucula vicksburgensis Conrad 1848 nut clam
R category
 Cerithioidea - Cerithiidae
"Semivertagus menthafontis n. sp." = Clava (Semivertagus)
"Semivertagus menthafontis n. sp." = Clava (Semivertagus) cerith snail