Bridgeboro Quarry (Oligocene of the United States)

Where: Worth County, Georgia (31.4° N, 84.0° W: paleocoordinates 31.5° N, 77.5° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Bridgeboro Limestone Formation, Early/Lower Oligocene (33.9 - 28.4 Ma)

• type locality of formation

•"Three (~1-3 m thick) zones of matrix-rich, algal-poor beds... occur within the quarry section. One of these zones corresponds to the upper 2 meters of the section and was sampled for paleoecologic analyses"

•fauna indicates a "Lower Oligocene" or "Vicksburgian" age

• group of beds-level stratigraphic resolution

Environment/lithology: open shallow subtidal; poorly lithified, concretionary, calcareous, cherty/siliceous sandstone and lithified, concretionary limestone

• a "high-energy" environment of "moderate to shallow water depth" on a carbonate shelf above wave base; "paucity of fine-grained sediments supports a low turbidity environment" with "a warm, normal marine, open-ocean setting" and an "irregular and mobile substrate produced by the rhodoliths"
• limestone is "dominated by a densely packed mass of algal rhodoliths... Compared to the rhodoliths the enclosing matrix is relatively soft, therefore facilitating collection... rhodoliths and enclosing carbonate sand have in part been replaced by chert... Lenses and pockets of a yellowish-green clay intercalated with the algal limestone occurs mostly in the upper 15 meters of the section"

Size class: macrofossils

Preservation: mold/impression

Collection methods: repository unclear

Primary reference: J. P. Manker and B. D. Carter. 1987. Paleoecology and paleogeography of an extensive rhodolith facies from the Lower Oligocene of south Georgia and north Florida. Palaios 2(2):181-188 [J. Alroy/J. Alroy]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 90567: authorized by John Alroy, entered by John Alroy on 06.08.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
 Foraminiferida -
"Foraminiferida indet." = Foraminifera
"Foraminiferida indet." = Foraminifera d'Orbigny 1826 foram
"4 species of smaller foraminifera"
Rotaliina
 Orbitoidacea - Lepidocyclinidae
Bivalvia
  -
Bivalvia indet. Linnaeus 1758 clam
"3 unidentified species"
 Arcida - Glycymerididae
Glycymeris cf. cookei Dall 1916 clam
 Pectinida - Pectinoidae
Chlamys sp. Röding 1798 scallop
Chlamys duncanensis Mansfield 1934 scallop
 Pectinida - Limidae
Lima sp. Bruguière 1797 file clam
 Ostreida - Ostreidae
Ostrea "sp. A" Linnaeus 1758 oyster
Ostrea "sp. B" Linnaeus 1758 oyster
 Mytilida - Mytilidae
Lithophaga nuda Dall 1898 mussel
 Cardiida - Veneridae
? Pitar sp. Römer 1857 venus clam
 Lucinida - Lucinidae
Phacoides sp. Blainville 1825 clam
Gastropoda
  -
Gastropoda indet. Cuvier 1797 snail
"2 or 3 unidentified species"
 Architaenioglossa - Ampullinidae
 Neogastropoda - Conidae
Conus sp. Linnaeus 1758 cone shell
 Sorbeoconcha - Turritellidae
Turritella sp. Lamarck 1799 turret shell
 Sorbeoconcha - Cerithiidae
Gymnolaemata
 Cheilostomata -
Cheilostomata indet. Busk 1859
"encrusting cheilostomes"
Echinoidea
 Cidaroida - Cidaridae
? Prionocidaris sp. Agassiz 1863 pencil urchin
 Spatangoida - Brissidae
Brissus sp. Gray 1825 heart urchin
 Cassiduloida - Cassidulidae
Rhyncholampas gouldii Bouvé 1846 sea urchin
 Clypeasteroida - Clypeasteridae
Clypeaster cotteaui Egozcue 1897 sand dollar
Anthozoa
  -
Anthozoa indet. Ehrenberg 1834
"unidentified colonial coral"
 Scleractinia - Caryophylliidae
? Trochocyathus sp. Milne-Edwards and Haime 1848 stony coral
Rhodophyceae
 Corallinales -
Archaeolithothamnium sp. Rothpletz 1891
 Corallinales - Corallinaceae
Lithoporella sp. Foslie 1909