Harvey Site - C (Eocene of the United States)

Where: Jackson County, Louisiana (32.3° N, 92.7° W: paleocoordinates 33.4° N, 83.8° W)

• coordinate based on nearby landmark

When: Cook Mountain Formation (Claiborne Group), Bartonian (41.3 - 38.0 Ma)

• "Three samples from the site were strontium dated forty-five million years old"

Environment/lithology: marine; shelly/skeletal limestone

• "The Clairborn Group is composed of a transgressive sequence including the Cane River, Sparta, Cook Mountain, and Cockfield (Rainwater, 1982). Cockfield fluvial deposits are also present in this area. The Cook Mountain Formation was deposited during the latter part of the Clairborne stage of the Tejas sequence. It shows a transgression with the influence from the Mississippi and possibly a Ouachita source (McCarley, 1981). The Laramide and Mexican Cordilleran orogens contributed large amounts of sediment to the Gulf throughout the Eocene (Frazier and Schwimmer, 1987)."
• 4"-6" Shell Hash Lag Deposit

Size classes: macrofossils, mesofossils

Collection methods: bulk, sieve,

• "Horizontal bulk samples were collected, disaggregated, sieved, and counted. Forty pounds of substrate were removed from a four inch horizontal layer near each lithological boundary ...These bulk samples were dried and a thirty pound sub-sample was boiled in Quaternary O solution until they disaggregated. The disaggregated sub-samples were sieved through USGS #10 and #14 sieves."

Primary reference: G. Zumwalt, J. Pratt, and J. Moncrief. 1995. Marine Macro-Invertebrate Paleoenvirionmental Interpretation of the Harvey Site (Cook Mountain, Eocene) in North-Central Louisiana. Mississippi Geology 16(1):12-21 [L. Ivany/P. Wall/P. Wall]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 44409: authorized by Linda Ivany, entered by Patrick Wall on 09.09.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• "To obtain a minimum number of species, bivalve valves were counted and divided by two. A valve was counted if more than one-half of the shell remained or if a majority of the cardinal processes and one-third of the shell remained. Whole gastropods and recognizable spires were counted. For scaphopods the toal length of the species pieces was divided by the average length of the species. Remains of bryozoan colonies were counted as an individual. Solitary corals were counted as one organism if more than one-half of the theca remained.

•...

•A type collection was established from surface samples and identifed using Dockery (1980) and MacNeil and Dockery (1984). This collection was confirmed by David T. Dockery of the Mississippi Office of Geology."

Show authors, comments, and common names
Bivalvia
 Arcida - Glycymerididae
Glycymeris trigonella
Glycymeris trigonella Conrad 1833 clam
 Ostreida - Ostreidae
Cubitostrea sellaeformis
Cubitostrea sellaeformis Conrad 1832 oyster
 Carditida - Crassatellidae
Crassatella texalta
Crassatella texalta Harris 1895 clam
 Nuculida - Nuculidae
Nucula (Nucula) mauricensis
Nucula (Nucula) mauricensis Harris 1919 nut clam
Gastropoda
 Neogastropoda - Turridae
"Coronia margaritosa" = Gemmula (Coronia)
"Coronia margaritosa" = Gemmula (Coronia) turrid
Gymnolaemata
 Cheilostomata - Lunulitidae
Lunulites sp.
Lunulites sp. Lamarck 1816