Horizon 9, Centerfield Member, Triphammer Falls, Genesee Valley, Livingston Co., (Devonian of the United States)

Where: Livingston County, New York (42.9° N, 77.8° W: paleocoordinates 36.7° S, 25.3° 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 lower transitional shales of the York submember of the Centerfield

• bed-level stratigraphic resolution

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

• nodular limestone within light gray to 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. Dynamic Stratigraphy and Depositional Environments of the Hamilton Group (Middle Devonian) in New York State, Part I, New York State Museum Bulletin (457)32-56 [A. Miller/K. Layou]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 8766: 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".
 Phacopida - Phacopidae
Phacops sp. Emmrich 1839 trilobite
 Productida - Chonetidae
 Strophomenida - Douvillinidae
 Strophomenida - Strophodontidae
Pholidostrophia sp. Hall and Clarke 1892
 Athyridida - Nucleospiridae
Nucleospira sp. Hall 1859
 Spiriferinida - Cyrtinidae
Cyrtina sp. Davidson 1858
 Spiriferida - Ambocoeliidae
Ambocoelia sp. Hall 1860
 Spiriferida - Elythidae
 Atrypida - Atrypidae
Pseudatrypa sp. Copper 1973
[entered as Pseudoatrypa sp.]
 Ostreida - Pterineidae
Actinopteria sp. Hall 1884 oyster
 Euomphalina - Platyceratidae
Naticonema sp. Perner 1903 snail
 Fenestrida - Fenestellidae
 Cystoporida - Sulcoreteporidae
 Cystoporida - Fistuliporidae
 Auloporida - Aulocystidae
Aulocystis sp. Schl├╝ter 1885 tabulate coral