Horizon 26-27, Centerfield Member, Wheeler Gully, Genesee Valley, Livingston Co. (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: Centerfield 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

• light gray claystone

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

• horizons 26 and 27 were combined because "they were difficult to sample".

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 8792: 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".
Strophomenata
 Strophomenida - Chonetidae
 Strophomenida - Leptostrophiidae
Rhynchonellata
 Spiriferida - Spinocyrtiidae
 Athyridida - Meristellidae
 Athyridida - Athyrididae
 Atrypida - Atrypidae
"Pseudatrypa sp." = Pseudoatrypa
"Pseudatrypa sp." = Pseudoatrypa Copper 1973
[entered as Pseudoatrypa sp.]
Trilobita
 Phacopida - Phacopidae
Phacops sp. Emmrich 1839 trilobite
Anthozoa
 Stauriida - Stereolasmatidae
Stereolasma sp. Simpson 1900 horn coral