Lake Carmel Pit (Base of Barrier Bar) - Miller III (1983) (Holocene of the United States)

Also known as Base of Barrier Bar, Lake Carmel Pit

Where: Orleans County, Louisiana (30.1° N, 90.0° W: paleocoordinates 30.1° N, 90.0° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Basal Member (New Orleans Barrier Trend Formation), Holocene (0.0 - 0.0 Ma)

• Five late Quaternary stratigraphic units are exposed at the Lake Carmel borrow pit. These in ascending order are : 1) deltaic equivalents of Deweyville terrace alluvium (Wisconsin); 2) a buried soil zone, "Little Woods paleosol" (late Wisconsin-early (Pleistocene); 3) bay-sound clay, "Michoud Formation" (middle Holocene); 4) barrier bar sand of the New Orleans trend (middle Holocene); 5) St Bernard prodeltaic and delta front deposits (late Holocene). This collection is from the basal Barrier Bar unit (New Orleans trend). The Michoud Formation grades upward into a thin discontinous clayey sand containing abundant mollusk shells. This clayey sand unit forms the bottom of a locally, shelly, fine to coarse sand unit containing numerous burrow systems. Radiocarbon dates on peat collected from this unit yield dates of 11,090 and 29,860 years, although most authors consider the unit to have accumulated between 4-5,000 years ago. The unit is 1.5m thick. The collection comes from depth 6.0-6.3 m

• bed-level stratigraphic resolution

Environment/lithology: coastal; fine-grained, coarse, shelly/skeletal sandstone

• Part of a sub-surface sand body that has been variously labeled "New Orleans barrier island".
• Locally, shelly, fine to coarse sand

Size class: macrofossils

Collection methods: bulk,

• All taxa collected and identified G. Mollyn. Unknown repository, though possibly Tulane University

Primary reference: W. Miller, III. 1983. Stratigraphy of newly exposed Quaternary seduments, eastern Orleans Parish, Louisiana. Tulane Studies in Geology and Paleontology 17(4):85-104 [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 41936: authorized by Austin Hendy, entered by Austin Hendy on 22.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for mollusca. Key to abundance data: a=abundant; c=common; mc=moderately common; u=uncommon; r=rare.
Bivalvia
 Arcida - Arcidae
"Anadara ovalis" = Lunarca ovalis
"Anadara ovalis" = Lunarca ovalis Bruguiere 1789 ark
 Ostreida - Ostreidae
Crassostrea virginica Gmelin 1791 oyster
 Pholadida - Pholadidae
Diplothyra smithii Tryon 1862 clam
Barnea truncata Say 1822 clam
Cyrtopleura costata Linnaeus 1758 clam
 Cardiida - Anatinellidae
"Raeta plicata" = Raeta plicatella
"Raeta plicata" = Raeta plicatella Lamarck 1818 clam
 Cardiida - Mactridae
Mulinia lateralis Say 1822 clam
 Cardiida - Ungulinidae
Diplodonta cf. soror Adams 1852 clam
 Cardiida - Veneridae
Mercenaria campechiensis Gmelin 1791 quahog
Dosinia discus Reeve 1850 venus clam
"Agriopoma texasiana" = Callocardia (Agriopoma) texasiana Dall 1892 venus clam
 Cardiida - Donacidae
Donax texasianus Philippi 1847 clam
 Cardiida - Tellinidae
"Tellina texana" = Angulus texanus Dall 1900 tellin clam
Tellidora cristata R├ęcluz 1842 tellin clam
Macoma tenta Say 1834 tellin clam
"Tellina alternata" = Tellina (Eurytellina) alternata Say 1822 tellin clam
 Cardiida - Semelidae
Abra aequalis Say 1822 abra
 Cardiida - Cardiidae
Dinocardium robustum Lightfoot 1786 cockle
 Thraciida - Periplomatidae
Periploma margaritaceum Lamarck 1801 clam
 Protobranchia - Nuculanidae
Nuculana concentrica Say 1824 Concentric Nut Clam
Gastropoda
 Ptenoglossa - Epitoniidae
Epitonium angulatum Say 1831 wentletrap
 Opisthobranchia - Cylichnidae
Acteocina canaliculata Say 1826 barrel-bubble
 Neogastropoda - Olividae
"Oliva sayana" = Oliva (Ispidula) sayana
"Oliva sayana" = Oliva (Ispidula) sayana Ravenel 1834 olive snail
 Neogastropoda - Buccinidae
"Cantharus cancellarius" = Solenosteira cancellaria
"Cantharus cancellarius" = Solenosteira cancellaria Conrad 1846 true whelk
 Neogastropoda - Nassariidae
"Nassarius vibex" = Nassarius (Nassarius) vibex, "Nassarius acutus" = Nassarius (Nassarius) acutus
"Nassarius vibex" = Nassarius (Nassarius) vibex Say 1822 snail
"Nassarius acutus" = Nassarius (Nassarius) acutus Say 1822 snail
 Neogastropoda - Marginellidae
"Marginella apicina" = Prunum apicinum
"Marginella apicina" = Prunum apicinum Menke 1828 margin shell
 Vanikoroidea - Eulimidae
"Balcis cf. jamaicensis" = Melanella jamaicensis
"Balcis cf. jamaicensis" = Melanella jamaicensis Adams 1845 snail
 Naticoidea - Naticidae
Neverita duplicatus Say 1822 moon snail
 Calyptraeoidea - Calyptraeidae
Crepidula fornicata Linnaeus 1758 slipper shell