NMB #10709 - 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 58681: 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.
Bivalvia
 Cardiida - Glossidae
Gastropoda
 Neogastropoda - Olividae
Oliva (? Strephonella) delata Jung 1971 olive snail
 Neogastropoda - Buccinidae
Cymatophos glareosus Jung 1971 true whelk
 Neogastropoda - Mitridae
Mitra limata Jung 1971 mitre shell
 Neogastropoda - Conidae
Conus sp. Linnaeus 1758 cone shell
 Ficoidea - Ficidae
Ficus carriacouensis Trechmann 1935 fig shell
 Naticoidea - Naticidae
 Calyptraeoidea - Calyptraeidae
Crucibulum sp. Schumacher 1817 slipper shell
 Tonnoidea - Personidae
Distorsio clathrata Lamarck 1816 snail
 Tonnoidea - Bursidae
Bursa rugosa Sowerby 1835 frog shell
 Sorbeoconcha - Cerithiidae
Rhinoclavis (Ochetoclava) sp. Woodring 1928 cerith snail
 Architectonicoidea - Architectonicidae
Architectonica kartseni sundial
Subspecies: Architectonica (A.) nobilis karsteni
 Pleurotomariida - Pleurotomariidae
 Trochoidea - Trochidae
Calliostoma sp. Swainson 1840 top snail
Calliostoma cf. tarltonense Jung 1971 top snail
Anthozoa
 Scleractinia - Pocilloporidae
Stylophora cf. imperatoris Vaughan 1919 stony coral
Pocillopora cf. baracoaensis Vaughan 1919 stony coral
 Scleractinia - Dendrophylliidae
Dendrophylliidae indet. Gray 1847 stony coral
 Scleractinia - Oculinidae
Madrepora sp. Linne 1758 stony coral
 Scleractinia - Caryophylliidae
Caryophylliidae indet. Gray 1847 stony coral
Desmophyllum sp. Ehrenberg 1834 stony coral