Savanah River [Hawthorn Fm] (Miocene of the United States)

Also known as [Marks Head marl]

Where: Jasper County, South Carolina (32.0° N, 80.9° W: paleocoordinates 32.4° N, 76.7° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Hawthorn Formation, Early/Lower Miocene (23.0 - 16.0 Ma)

• STRATIGRAPHIC RELATIONS: From the Hawthorn Fm, which presumably regionally unconformably overlies Eocene units, and is regionally unconformaly overlain by the Raysor Marl; originally referred to as the Marks Head Marl. AGE: Early Miocene. STRATIGRAPHIC POSITION: From unknown position in formation.

• group of beds-level stratigraphic resolution

Environment/lithology: coastal; lithified marl

• ENVIRONMENT: Shallow marine, shelfal siliciclastic.
• SPECIFIC LITHOLOGY: Marl. LITHIFICATION: Lithified, on the basis of facies description.

Size class: macrofossils

Collected by Gardner

Collection methods: surface (in situ),

• COLLECTORS: J. Gardner (1920's). REPOSITORIES: Unknown.

Primary reference: C. W. Cooke. 1936. Geology of the Coastal Plain of South Carolina. United States Geological Survey Bulletin 837 [A. Hendy/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 92430: authorized by Austin Hendy, entered by Austin Hendy on 12.11.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for bivalves and gastropods. NOMENCLATURE: Identified by J. Gardner; not an authoritative publication and with antiquated nomenclature but with species-resolution identifications. Nomenclature updated with subsequent publications.
Maxillopoda
 Sessilia - Balanidae
Balanus sp. Da Costa 1778 barnacle
Bivalvia
 Arcida - Arcidae
 Pectinida - Pectinoidae
 Pectinida - Anomiidae
 Ostreida - Ostreidae
Ostrea normalis Gardner 1926 oyster
 Mytilida - Mytilidae
Mytilus conradinus d'Orbigny 1852 mussel
 Carditida - Astartidae
Astarte sp. Sowerby 1816 clam
 Carditida - Carditidae
"Venericardia (Pteromeris) cf. perplana" = Pteromeris perplana
"Venericardia (Pteromeris) cf. perplana" = Pteromeris perplana Dall 1903 clam
SUBSPECIES: Venericardia (Pteromeris) cf. perplana alternata
 Pholadida - Corbulidae
Corbula sp. Bruguière 1789 clam
 Cardiida - Mactridae
Mactra sp. Linnaeus 1767 clam
Spisula sp. Gray 1837 clam
 Cardiida - Veneridae
Dosinia cf. chipolana Dall 1903 venus clam
Macrocallista sp. Meek 1876 venus clam
 Cardiida - Donacidae
Donax sp. Linnaeus 1758 clam
 Cardiida - Tellinidae
Strigilla sp. Turton 1822 tellin clam
 Cardiida - Cardiidae
Cardium sp. Linnaeus 1758 cockle
 Lucinida - Lucinidae
"Phacoides (Parvilucina) cf. piluliformis" = Parvilucina, "Phacoides (Here) cf. parawhitfieldi" = Here, "Phacoides (Parvilucina) trisulcatus" = Cavilinga trisulcata
"Phacoides (Parvilucina) cf. piluliformis" = Parvilucina clam
"Phacoides (Here) cf. parawhitfieldi" = Here clam
"Phacoides (Parvilucina) trisulcatus" = Cavilinga trisulcata Conrad 1841 clam
Gastropoda
 Naticoidea - Naticidae
"Natica (Cryptonatica) cf. platabasis" = Cryptonatica
"Natica (Cryptonatica) cf. platabasis" = Cryptonatica moon snail
 Sorbeoconcha - Turritellidae
Turritella alcida turret shell
SUBSPECIES: Turritella alcida bicarinata
 Trochoidea - Trochidae
Calliostoma sp. Swainson 1840 top snail
Calliostoma cf. aphelium Dall 1892 top snail