Horizon 33, Ledyard Member, Wheeler Gully, Genesee Valley, Livingston Co., NY: Givetian, New York

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Paleozygopleura sp.
8 individuals
Anthozoa - Favositida - Micheliniidae
Pleurodictyum sp. Goldfuss 1829
2 individuals
Anthozoa - Auloporida - Aulocystidae
Aulocystis sp. Schlüter 1885
32 individuals
Trilobita - Phacopida - Phacopidae
Phacops sp. Emmrich 1839
1 individual
Trilobita - Phacopida - Acastidae
Greenops sp. Delo 1935
3 individuals
Rhynchonellata - Atrypida - Atrypidae
Pseudatrypa sp. (Copper 1973)
1 individual
original and current combination Pseudoatrypa
[entered as Pseudoatrypa sp.]
Rhynchonellata - Rhynchonellida - Leiorhynchidae
Leiorhynchus sp. Hall 1860
1 individual
Rhynchonellata - Spiriferida - Mucrospiriferidae
Mucrospirifer mucronatus (Conrad 1841)
2 individuals
Rhynchonellata - Spiriferida - Ambocoeliidae
Ambocoelia sp. Hall 1860
8 individuals
Strophomenata - Strophomenida - Chonetidae
Devonochonetes sp. Muir-Wood 1962
89 individuals
Longispina sp.
1 individual
Bivalvia - Nuculanida - Cucullellidae
Nuculites sp. Conrad 1841
1 individual
Bivalvia - Myalinida - Lunulacardiidae
Pterochaenia sp. Clarke 1904
3 individuals
Gastropoda - Bellerophontida - Bellerophontidae
Bucanopsis sp. Ulrich and Scofield 1897
see common names

Geography
Country:United States State/province:New York County:Livingston
Coordinates: 42.8° North, 77.8° West (view map)
Paleocoordinates:36.7° South, 25.4° West
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:387.70000 - 382.70000 m.y. ago
Stratigraphy
Formation:Ludlowville Member:Ledyard
Local section:Wheeler Gully Local bed:33
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:8798
Authorizer:A. Miller Enterer:K. Layou
Modifier:C. Ferguson Research group:marine invertebrate
Created:2000-08-29 14:14:42 Last modified:2004-04-27 18:49:56
Access level:the public Released:2000-11-20 13:53:40
Creative Commons license:CC BY
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]