USGS Loc. 7474 - Rock Creek [Jackson Bluff Fm] (Pliocene of the United States)

Where: Franklin County, Florida (29.9° N, 84.7° W: paleocoordinates 29.9° N, 84.0° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Jackson Bluff Formation (Alum Bluff Group), Late/Upper Pliocene (3.6 - 2.6 Ma)

• Cancellaria Zone of Choctawhatchee Formation, Alum Bluff Group. The Cancellaria zone is in the highest fossiliferous beds along Harveys Creel. The total thickness of this zone is 25-30 ft. Late Miocene age based on recent lithostratigraphy. Local section name = Rock Creek, Basinal/regional section name = Franklin. Placed in Jackson Bluff Fm (and therefore Late Pliocene) by enterer.

• bed-level stratigraphic resolution

Environment/lithology: coastal; unlithified, fine-grained, coarse, shelly/skeletal, argillaceous sandstone

• No reported geologic or paleoenvironmental data. Probably shallow water siliciclastic depositional environment.
• The sediments comprising the Cancellaria Zone consist of a fine to coarse grained clayey sand containing many fossils. Lithification data not reported, but all figured specimens appear to be free of matrix so an unlithified classification is assigned.

Size class: macrofossils

Reposited in the USNM

• Specimens are lodged in USNM collections. Collected by E.H. Sellards (1917)

Primary reference: W. C. Mansfield. 1930. Miocene gastropods and scaphopods of the Choctawatchee Formation of Florida. Florida State Geological Survey Bulletin 3 [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 61155: authorized by Austin Hendy, entered by Austin Hendy on 30.05.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

• Probably exhaustive for Mollusca. Certainly good nomenclatural treatment.
 Pectinida - Pectinoidae
Amusium mortoni Ravenel 1844 scallop
"Chlamys (Plagioctenium) comparilis" = Aequipecten comparilis Tuomey and Holmes 1855 scallop
 Pectinida - Anomiidae
Placunanomia plicata Tuomey and Holmes 1857 scallop