Juan Griego, Margarita Island (Pleistocene of Venezuela)

Where: Venezuela (4.9° N, 62.1° W: paleocoordinates 4.9° N, 62.1° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Late/Upper Pleistocene (0.1 - 0.0 Ma)

• STRATIGRAPHIC RELATIONS: Occurs in proximity to the Pleistocene-Pliocene Falca Sands (Richards 1962) that is 70 m thick. LITHOSTRATIGRAPHY: No lithostratigraphic units named in text. AGE: Pleistocene (Richards 1943, 1962) based on the high proportion of Recent species (89%). Late Pleistocene (Sangamon) age has been suggested by Richards (1938) for a similar fauna from Florida and Cozumel Island, Mexico (Richards, 1935, 1937). STRATIGRAPHIC POSITION: At no place observed do Pleistocene deposits occur higher than 12-15 ft above sea level.

• bed-level stratigraphic resolution

Environment/lithology: coastal; unlithified lime mudstone

• ENVIRONMENT: Definately shallow water, possibly littoral zone. SEQUENCE STRATIGRAPHY: Probably deposited during interglacial, hence transgressive
• SPECIFIC LITHOLOGY: Unconsolidated limy clay. LITHIFICATION: Unlithified as stated to be unconsolidated and based on figured specimens.

Size class: macrofossils

Reposited in the ANSP

• COLLECTORS: Collected by H.G. Richards (1939). REPOSITORIES: Collections held in the Academy of Natural Sciences (ANSP) and the Museo de Ciencias Naturales in Caracas, Venezuela.

Primary reference: H. G. Richards. 1943. Pleistocene mollusks from Margarita Island, Venezuela. Journal of Paleontology 17(1):120-123 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 66753: authorized by Austin Hendy, entered by Austin Hendy on 15.10.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for gastropoda and bivalvia. NOMENCLATURE: An authoratative publication, although somewhat antiquated. However, all occurrences include species-resolution assignments.
Bivalvia
 Arcida - Arcidae
"Arca chemnitzii" = Anadara (Cunearca) chemnitzii
"Arca chemnitzii" = Anadara (Cunearca) chemnitzii Philippi 1851 ark
 Pholadida - Corbulidae
"Corbula barrattiana" = Caryocorbula caribaea, Corbula cribaria
"Corbula barrattiana" = Caryocorbula caribaea d'Orbigny 1845 clam
 Cardiida - Chamidae
Chama sp. Linnaeus 1758 jewel box
 Cardiida - Veneridae
Gemma gemma Totten 1834 venus clam
 Cardiida - Donacidae
"Donax denticulata" = Donax denticulatus
"Donax denticulata" = Donax denticulatus Linnaeus 1758 clam
 Cardiida - Tellinidae
Tellina venezuelensis n. sp. Richards 1943 tellin clam
Macoma constricta Bruguière 1792 tellin clam
Gastropoda
 Neogastropoda - Nassariidae
"Nassarius vibex" = Nassarius (Nassarius) vibex
"Nassarius vibex" = Nassarius (Nassarius) vibex Say 1822 snail
 Neogastropoda - Melongenidae
"Melongena melongena" = Melongena melongena, "Melongena margaritana n. sp." = Melongena melongena
"Melongena melongena" = Melongena melongena Linnaeus 1758 snail
"Melongena margaritana n. sp." = Melongena melongena Linnaeus 1758 snail
 Neogastropoda - Marginellidae
"Marginella nivea" = Prunum pruinosum, "Marginella apicina" = Prunum apicinum, Marginella chrysometina
"Marginella nivea" = Prunum pruinosum Hinds 1844 margin shell
"Marginella apicina" = Prunum apicinum Menke 1828 margin shell
 Sorbeoconcha - Potamididae
 Sorbeoconcha - Turritellidae
"Turritella variegata" = Turritella (Broderiptella) variegata
"Turritella variegata" = Turritella (Broderiptella) variegata Linnaeus 1758 turret shell
 Sorbeoconcha - Cerithiidae
"Cerithium variabile" = Cerithium lutosum
"Cerithium variabile" = Cerithium lutosum Menke 1828 cerith snail
 Neritoidea - Neritidae
Neritina virginea Linnaeus 1758 snail