Horizon 30, Ledyard Member, Wheeler Gully, Genesee Valley, Livingston Co., NY: Givetian, New York

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Anthozoa - Favositida - Micheliniidae
Pleurodictyum sp. Goldfuss 1829
1 individual
Anthozoa - Auloporida - Aulocystidae
Aulocystis sp. Schlüter 1885
148 individuals
Anthozoa - Stauriida - Stereolasmatidae
Stereolasma sp. Simpson 1900
10 individuals
Strophomenata - Strophomenida - Leptostrophiidae
3 individuals
Strophomenata - Strophomenida - Douvillinidae
2 individuals
Strophomenata - Strophomenida - Chonetidae
7 individuals
6 individuals
Rhynchonellata - Orthida - Rhipidomellidae
1 individual
Rhynchonellata - Athyridida - Nucleospiridae
Nucleospira sp. Hall 1859
1 individual
Rhynchonellata - Athyridida - Meristellidae
1 individual
Rhynchonellata - Atrypida - Atrypidae
Pseudatrypa sp. (Copper 1973)
36 individuals
[entered as Pseudoatrypa sp.]
Rhynchonellata - Spiriferida - Ambocoeliidae
Ambocoelia sp. Hall 1860
5 individuals
Rhynchonellata - Spiriferida - Elythidae
1 individual
Rhynchonellata - Spiriferida - Mucrospiriferidae
1 individual
Stenolaemata - Cystoporida - Sulcoreteporidae
Stenolaemata - Cystoporata - Fistuliporidae
Stenolaemata - Cryptostomata - Fenestellidae
Bivalvia - Nuculanida - Malletiidae
2 individuals
[entered as Paleoneilo sp.]
Bivalvia - Myalinida - Lunulacardiidae
Pterochaenia sp. Clarke 1904
1 individual
Bivalvia - Modiomorphida - Cypricardiniidae
14 individuals
Gastropoda - Euomphalina - Platyceratidae
1 individual
Trilobita - Phacopida - Phacopidae
2 individuals
Trilobita - Phacopida - Acastidae
Greenops sp. Delo 1935
1 individual
see common names

Geography
Country:United States State/province:New York County:Livingston
Coordinates: 42.8° North, 77.8° West (view map)
Paleocoordinates:31.1° South, 45.5° West (Wright 2013)
Basis of coordinate:based on nearby landmark
Geographic resolution:small collection
Time
Period: Devonian Epoch: Middle Devonian
Stage: Givetian 10 m.y. bin: Devonian 3
Key time interval: Givetian
Age range of interval: 387.95 - 382.31 m.y. ago
Stratigraphy
Formation:Ludlowville Member:Ledyard
Local section:Wheeler Gully Local bed:30
Local order:bottom to top
Regional section:Genesee Valley
Stratigraphic resolution:bed
Stratigraphy comments: this horizon is within the upper transitional shales of the Wheeler Gully submember of the Centerfield
Lithology and environment
Primary lithology:gray claystone
Lithology description: dark gray claystone
Environment:transition zone/lower shoreface Tectonic setting:foreland basin
Taphonomy
Modes of preservation:body
Collection methods and comments
Collection methods:bulk,surface (in situ),chemical,mechanical,field collection,observed (not collected)
Reason for describing collection:paleoecologic analysis
Taxonomic list comments: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".
Metadata
Database number:8795
Authorizer:A. Miller Enterer:K. Layou
Modifier:C. Ferguson Research group:marine invertebrate
Created:2000-08-29 13:55:37 Last modified:2025-02-22 15:12:02
Access level:the public Released:2000-11-20 13:53:40
Creative Commons license:CC0
Reference information

Primary reference:
684. 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]