Horizon 33, Ledyard Member, Wheeler Gully, Genesee Valley, Livingston Co., NY (Devonian of the United States)

Where: Livingston County, New York (42.8° N, 77.8° W: paleocoordinates 36.7° S, 25.4° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Ledyard Member (Ludlowville Formation), Givetian (387.7 - 382.7 Ma)

• this horizon is within the upper transitional shales of the Wheeler Gully submember of the Centerfield

• bed-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; gray claystone

• dark gray claystone

Collection methods: bulk, surface (in situ), chemical, mechanical,

Primary reference: M. Savarese, L. M. Gray, and C. E. Brett. 1986. Faunal and Lithologic Cyclicity in the Centerfield Member (Middle Devonian: Hamilton Group) of Western New York: A Reinterpretation of Depositional History. In E. Landing, C. E. Brett (eds.), Dynamic Stratigraphy and Depositional Environments of the Hamilton Group (Middle Devonian) in New York State, Part I 457:32-56 [A. Miller/K. Layou/P. Wagner]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 8798: authorized by Arnold Miller, entered by Karen Layou on 29.08.2000

Creative Commons license: CC BY (attribution)

Taxonomic list

• Data is presented in two ways in the paper: as presence/absence data for all 34 sampled horizons, and standardized abundances for 23 of those horizons. Where available, abundance data is entered. Counts from bulk sampling "were adjusted uniformly for fragmented and single valve occurences by multiplying through a ratio--4 fragments or 2 valve equal to one occurence." Standardization means "bulk sampling counts were standardized by sample weight".
unclassified
  -
Strophomenata
 Strophomenida - Chonetidae
Rhynchonellata
 Spiriferida - Mucrospiriferidae
 Spiriferida - Ambocoeliidae
Ambocoelia sp. Hall 1860
 Atrypida - Atrypidae
"Pseudatrypa sp." = Pseudoatrypa
"Pseudatrypa sp." = Pseudoatrypa Copper 1973
[entered as Pseudoatrypa sp.]
 Rhynchonellida - Leiorhynchidae
Leiorhynchus sp. Hall 1860
Gastropoda
 Bellerophontida - Bellerophontidae
Bucanopsis sp. Ulrich and Scofield 1897 snail
Bivalvia
 Nuculanida - Cucullellidae
Nuculites sp. Conrad 1841 clam
 Myalinida - Lunulacardiidae
Pterochaenia sp. Clarke 1904 clam
Trilobita
 Phacopida - Phacopidae
Phacops sp. Emmrich 1839 trilobite
 Phacopida - Acastidae
Greenops sp. Delo 1935 trilobite
Anthozoa
 Favositida - Micheliniidae
Pleurodictyum sp. Goldfuss 1829 tabulate coral
 Auloporida - Aulocystidae
Aulocystis sp. Schlüter 1885 tabulate coral