FGS Station 1/966 - Double Branch [Jackson Bluff] (Pliocene of the United States)

Where: Leon County, Florida (30.4° N, 84.6° W)

• Paleocoordinates: 30.9° N, 83.5° W (Wright 2013)

• 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 = Bloxham, Basinal/regional section name = Leon. Placed in Jackson Bluff Fm (and hence Late Pliocene) by enterer.

• group of beds-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 Mansfield (1925)

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 59491: authorized by Austin Hendy, entered by Austin Hendy on 03.04.2006, edited by Bethany Allen

Creative Commons license: CC0 (CC0)

Taxonomic list

• Probably exhaustive for Mollusca. Certainly good nomenclatural treatment.
Gastropoda
 Neogastropoda - Nassariidae
 Cerithioidea - Scaliolidae
Bivalvia
 Arcida - Arcidae
 Pectinida - Pectinoidae
 Carditida - Carditidae
 Cardiida - Cardiidae
 Cardiida - Veneridae
Gastropoda
 Sorbeoconcha - Cerithiopsidae
Cerithiopsis "sp. C" Hanley 1849 snail
 Sorbeoconcha - Vermetidae
Petaloconchus sculpturatus Lea 1846 worm shell
 Neogastropoda - Olividae
"Oliva sayana" = Oliva (Ispidula) sayana
"Oliva sayana" = Oliva (Ispidula) sayana Ravenel 1834 olive snail
 Cerithioidea - Turritellidae
Vermicularia spirata Philippi 1836 wormsnail
"Turritella duplinensis" = Turritella (Torculoidella) duplinensis Gardner and Aldrich 1919 turret shell
 Trochoidea - Trochidae
"Tegula (Omphalius) exoleta" = Chlorostoma (Omphalius)
"Tegula (Omphalius) exoleta" = Chlorostoma (Omphalius) top snail
Bivalvia
 Nuculida - Nuculidae
"Nucula proxima" = Nucula (Nucula) proxima
"Nucula proxima" = Nucula (Nucula) proxima Say 1820 Atlantic Nut Clam
 Nuculanida - Nuculanidae
"Leda trochilia coensis" = Nuculana, "Leda trochilia hamlinensis" = Nuculana
"Leda trochilia coensis" = Nuculana pointed nut clam
"Leda trochilia hamlinensis" = Nuculana pointed nut clam
 Pectinida - Plicatulidae
"Plicatula marginata" = Plicatula gibbosa
"Plicatula marginata" = Plicatula gibbosa Lamarck 1801 scallop
 Pectinida - Pectinoidae
"Chlamys (Plagioctenium) comparilis" = Aequipecten comparilis
"Chlamys (Plagioctenium) comparilis" = Aequipecten comparilis Tuomey and Holmes 1855 scallop
 Arcida - Arcidae
"Arca (Anadara) improcera" = Anadara, "Arca (Anadara) lienosa" = Anadara (Rasia) lienosa
"Arca (Anadara) improcera" = Anadara ark
"Arca (Anadara) lienosa" = Anadara (Rasia) lienosa Say 1832 ark
 Arcida - Glycymerididae
Glycymeris americana Defrance 1826 bittersweet clam
 Mytilida - Mytilidae
 Lucinida - Lucinidae
Phacoides (Bellucina) tuomeyi, "Phacoides (Parvilucina) multilineatus" = Parvilucina multistriata
"Phacoides (Parvilucina) multilineatus" = Parvilucina multistriata Conrad 1841 clam
 Cardiida - Chamidae
Chama congregata Conrad 1833 jewel box
 Cardiida - Veneridae
Dosinia (Dosinidia) elegans, "Gafrarium (Gouldia) metastriatum" = Gouldia
Dosinia (Dosinidia) elegans Conrad 1838 venus clam
"Gafrarium (Gouldia) metastriatum" = Gouldia venus clam
 Cardiida - Tellinidae