NMB #10703 - Grand Bay Fm (Carriacou) (Miocene of Grenada)

Where: Grenada (12.5° N, 61.4° W: paleocoordinates 12.2° N, 61.1° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Grand Bay Formation, Middle Miocene (16.0 - 11.6 Ma)

• The principal, nominal sedimentary units of the mid-Tertiary succession of Carriacou are the Belmont Formation (lower Miocene), Kendeace Formation (lower Miocene), Carriacou Formation (middle Miocene) and Grand Bay Formation (middle Miocene). The collection originates from sandy facies of the Grand Bay Fm. Jung (1971) assigns this a Middle Miocene age based on faunal affinities with other circum-Caribbean units.

• bed-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; poorly lithified tuff

• Most collections of the Grand Bay Fm may have lived in inner shelf depths of 20-50 m, although some may be deeper, or at least have had shallow-water fauna transported offshore. The fauna of the tuffaceous facies appears to have been deposited in slightly shallower water and is here assigned a "transition zone/lw shoreface" environment.
• Tuffaceous facies. From specimens presented in photgraphic plates most material from Carriacou appears to be from poorly-lithified as opposed to cemented, or unconsolidated sediments. No information provided in text

Size class: macrofossils

Reposited in the NMB

• Naturhistorisches Museum, Basel, Switzerland.

Primary reference: P. Jung. 1971. Fossil mollusks from Carriacou, West Indies. Bulletins of American Paleontology 61(269):1-262 [A. Miller/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 58676: authorized by Austin Hendy, entered by Austin Hendy on 20.02.2006, edited by Uta Merkel

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for Mollusca. Later publications may list non-molluscan taxa from these units. These are not available at this time.
 Arcida - Glycymerididae
Glycymeris sp. Da Costa 1778 clam
 Pectinida - Pectinoidae
Pecten aff. ventonensis Cooke 1919 scallop
Chlamys sp. Röding 1798 scallop
 Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758 oyster
 Carditida - Crassatellidae
Eucrassatella sp. Iredale 1924 clam
 Carditida - Carditidae
Venericardia sp. Lamarck 1801 clam
 Cardiida - Cardiidae
Trigoniocardia sp. Dall 1900 cockle
 Cerithiacea - Cerithiidae
Rhinoclavis (Ochetoclava) sp. Woodring 1928 cerith snail
 Neogastropoda - Olividae
Oliva (? Strephonella) delata Jung 1971 olive snail
Oliva (? Omogymna) valens Jung 1971 olive snail
 Neogastropoda - Turridae
Polystira opulenta Jung 1971 turrid
 Neogastropoda - Muricidae
Chicoreus jungi Vokes 1990 murex snail
 Neogastropoda - Drilliidae
Hindsiclava consors Sowerby 1850 snail
 Neogastropoda - Conidae
Conus sp. Linnaeus 1758 cone shell
Conus cf. consobrinus Sowerby 1850 cone shell
Conus cf. imitator Brown and Pilsbry 1911 cone shell
 Neogastropoda - Terebridae
Terebra (? Myurellina) sp. Bartsch 1923 auger snail
Terebra lehneri Rutsch 1934 auger snail
 Stromboidea - Strombidae
Strombus sp. Linnaeus 1758 conch
 Ficoidea - Ficidae
Ficus carriacouensis Trechmann 1935 fig shell
 Cypraeoidea - Cypraeidae
Macrocypraea cf. zebra Linnaeus 1758 cowry
 Vermetoidea - Vermetidae
Serpulorbis (Serpulorbis) sp. Sasso 1827 worm shell
 Calyptraeoidea - Calyptraeidae
Crucibulum sp. Schumacher 1817 slipper shell
 Tonnoidea - Bursidae
Bursa rugosa Sowerby 1835 frog shell
 Tonnoidea - Cassidae
? Semicassis sp. Mörch 1852 snail
 Sorbeoconcha - Turritellidae
Turritella (Bactrospira) altilira Conrad 1857 turret shell
Subspecies: Turritella (Bactrospira) altilira altilira
 Neritoidea - Neritidae
"Nerita (? Nerita) exuvioides" = Nerita (Theliostyla) exuvioides
"Nerita (? Nerita) exuvioides" = Nerita (Theliostyla) exuvioides Trechmann 1935 snail
 Trochoidea - Trochidae
Calliostoma sp. Swainson 1840 top snail
 Dentaliida - Dentaliidae
 Scleractinia - Caryophylliidae
Caryophylliidae indet. Gray 1847 stony coral
 Scleractinia - Flabellidae
Flabellum ex gr. pavoninum Lesson 1831 stony coral