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
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
Gastropoda | |
Acteocina canaliculata Say 1826 barrel-bubble | |
Crepidula fornicata Linnaeus 1758 slipper shell | |
Epitonium angulatum Say 1831 wentletrap | |
Neverita duplicatus Say 1822 moon snail | |
Nassarius vibex, "Nassarius acutus" = Nassarius (Nassarius) acutus
Nassarius vibex Say 1822 snail
"Nassarius acutus" = Nassarius (Nassarius) acutus Say 1822 snail | |
"Cantharus cancellarius" = Solenosteira cancellaria
"Cantharus cancellarius" = Solenosteira cancellaria Conrad 1846 true whelk | |
"Oliva sayana" = Oliva (Ispidula) sayana
"Oliva sayana" = Oliva (Ispidula) sayana Ravenel 1834 olive snail | |
"Marginella apicina" = Prunum apicinum
"Marginella apicina" = Prunum apicinum Menke 1828 margin shell | |
"Balcis cf. jamaicensis" = Melanella jamaicensis
"Balcis cf. jamaicensis" = Melanella jamaicensis Adams 1845 snail | |
Bivalvia | |
Nuculana concentrica Say 1824 Concentric Nut Clam | |
Crassostrea virginica Gmelin 1791 oyster | |
"Anadara ovalis" = Lunarca ovalis
"Anadara ovalis" = Lunarca ovalis Bruguiere 1789 ark | |
Dinocardium robustum Lightfoot 1786 cockle | |
Abra aequalis Say 1822 abra | |
Donax texasianus Philippi 1847 clam | |
"Tellina texana" = Angulus texanus, Tellidora cristata, "Tellina alternata" = Tellina (Eurytellina) alternata, Macoma tenta
"Tellina texana" = Angulus texanus Dall 1900 tellin clam
Tellidora cristata Récluz 1842 tellin clam
"Tellina alternata" = Tellina (Eurytellina) alternata Say 1822 tellin clam
Macoma tenta Say 1834 tellin clam | |
Diplodonta cf. soror Adams 1852 clam | |
Dosinia discus Reeve 1850 venus clam
Mercenaria campechiensis Gmelin 1791 quahog
"Agriopoma texasiana" = Callocardia (Agriopoma) texasiana Dall 1892 venus clam | |
Mulinia lateralis Say 1822 clam | |
"Raeta plicata" = Raeta plicatella
"Raeta plicata" = Raeta plicatella Lamarck 1818 clam | |
Cyrtopleura costata Linnaeus 1758 clam
Diplothyra smithii Tryon 1862 clam
Barnea truncata Say 1822 clam | |
Periploma margaritaceum Lamarck 1801 clam |