LGS 8 formerly Locality #8 - Logansport Formation (Paleocene to of the United States)

Also known as M 81

Where: Natchitoches County, Louisiana (31.6° N, 93.6° W: paleocoordinates 35.5° N, 75.2° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Logansport Formation (Midway Group), Danian to Danian (66.0 - 56.0 Ma)

• JAS has updated the age of this collection.

•Some confusion about the age of collections from this reference. While text states them to be Eocene, the Wilcox Group is in fact late Paleocene. No finer lithostratigraphic designation is stated in text, but Toulmin (1977) reports many of LeBlanc's taxa as belonging to the Logansport Formation of Sabine Parish, Louisiana. Logansport Formation lies betweent the Naborton and Hall Summit Formations, all of Thanetian age, and underlies further the Ypresian (Earliest Eocene) Marthaville, Pendleton and Sabinetown Formations.

• bed-level stratigraphic resolution

Environment/lithology: offshore; lithified, brown, yellow, sandy siltstone

• No paleoenvironmental data stated. Appears to be a shallow shelfal environment. Enterer has designated it as "offshore siliciclastic".
• Yellowish brown sandy siltstone overlain by calcareous siltstone concretions

Size classes: macrofossils, mesofossils

Collection methods: Collected by LaBlanc and Barry (1939).

Primary reference: R. J. LeBlanc and J.O. Barry. 1941. Fossiliferous localities of Midway Group in Louisiana. Bulletin of the American Association of Petroleum Geologists 25(4):734-738 [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 52197: authorized by Austin Hendy, entered by Austin Hendy on 30.07.2005, edited by Laurie Eccles

Creative Commons license: CC BY (attribution)

Taxonomic list

• Antiquated nomenclature. Reviewed by LaBlanc (1942), and some names are validated by Toulmin (1977).
 Ostreida - Ostreidae
Ostrea "sp. H"2 Linnaeus 1758 oyster
 Ostreida - Pinnidae
 Carditida - Carditidae
 Pholadida - Corbulidae
Corbula sp. Bruguière 1789 clam
 Pholadida - Pholadidae
Martesia sp. Sowerby 1824 clam
 Cardiida - Tellinidae
Tellina estellensis1 tellin clam
 Nuculanida - Yoldiidae
 Nuculanida - Nuculanidae
"Nuculana fiski n. sp." = Nuculana1, "Leda sp." = Nuculana
"Nuculana fiski n. sp." = Nuculana1 pointed nut clam
"Leda sp." = Nuculana Link 1807 pointed nut clam
 Opisthobranchia - Retusidae
Retusa (Cylichnina) "sp. B"2 Monterasato 1884 snail
 Opisthobranchia - Bullidae
Bullinella sp. Newton snail
 Sorbeoconcha - Rostellariidae
 Neogastropoda - Volutidae
Athleta petrosa Conrad 1833 volute
 Neogastropoda - Costellariidae
Orthosurcula persa ribbed mitre
including subspecies "Orthosurcula persa pleasanthillensis"
 Neogastropoda - Columbellidae
Mitrella sp. Risso 1826 snail
 Neogastropoda - Melongenidae
Levifusus sp.1 Conrad 1865 snail
Levifusus sp. C
"Levifusus pagoda" = Levifusus pagodiformis Heilprin 1881 snail
Cornulina sp. Conrad 1853 snail
 Neogastropoda - Turridae
 Sorbeoconcha - Naticidae
 Cerithioidea - Turritellidae
Turritella aldrichi turret shell
Turritella "sp. B" Lamarck 1799 turret shell
Turritella gardnerae2 turret shell
Turritella "sp. L"2 Lamarck 1799 turret shell
 Lepetellida - Fissurellidae
? Fissurella sp. Bruguière 1789 snail