Denley Limestone, Dolgeville (Ordovician of the United States)

Where: New York (43.0° N, 75.0° W: paleocoordinates 27.8° S, 53.2° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Orthograptus ruedemanni graptolite zone, Dolgeville Member (Denley Limestone Formation), Chatfieldian (453.8 - 451.0 Ma)

• Triarthrus community; samples restricted to autochthonous black shales, listed as Middle Caradoc/Denmarkian

• member-level stratigraphic resolution

Environment/lithology: offshore shelf; poorly lithified, black, calcareous shale

• Possibly below oxygen isocline; No algae!
• Alternating layers of thick calcisiltites and thick (up to 7 inches) black shales, and rare fine-grained calcarenites (turbidites)

Size classes: macrofossils, mesofossils

Preservation: trace

Primary reference: R. Titus and B. Cameron. 1976. Fossil communities of the lower Trenton Group (Middle Ordovician) of central and northwestern New York State. Journal of Paleontology 50:1209-1225 [P. Novack-Gottshall/P. Hearn]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 76093: authorized by Phil Novack-Gottshall, entered by Paul Hearn on 13.11.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Conodonta
 Protopanderodontida - Drepanoistodontidae
Drepanoistodus sp., Drepanoistodus suberectus
Drepanoistodus sp. Lindstrom 1971 conodont
Drepanoistodus suberectus Branson and Mehl 1933 conodont
Rhynchonellata
 Orthida - Dalmanellidae
Paucicrura rogata
Paucicrura rogata Sardeson 1892
Lingulata
 Lingulida - Pseudolingulidae
"Lingula curta" = Pseudolingula curta
"Lingula curta" = Pseudolingula curta Conrad 1842
 Lingulida - Obolidae
Leptobolus insigna, "Lingula riciniformis" = Glossina riciniformis
"Lingula riciniformis" = Glossina riciniformis Hall 1847
Bivalvia
 Unioni - Lyrodesmatidae
Lyrodesma sp.
Lyrodesma sp. Conrad 1841 clam
Cephalopoda
 Dissidocerida - Geisonoceratidae
Geisonoceras tenuitextum
Ostracoda
 Palaeocopida - Beyrichiidae
Beyrichia sp.
Beyrichia sp. M'Coy 1846 ostracod
 Podocopida - Bythocyprididae
Bythocypris cylindrica
Bythocypris cylindrica Hall 1871 ostracod
 Beyrichicopida - Bolliidae
Dicranella bivertex
 Hollinocopida - Euprimitiidae
Primitiella unicornis
 Leperditellocopida - Primitiidae
Primitia "indet. sp.1", Primitia "indet. sp.2"
Primitia "indet. sp.1" Jones and Holl 1923 ostracod
Primitia "indet. sp.2" Jones and Holl 1923 ostracod
 Leperditellocopida - Aparchitidae
Aparchites minutissimus
Aparchites minutissimus ostracod
"trentonensis"
Trilobita
 Olenida - Olenidae
Triarthrus becki
Triarthrus becki Green 1832 trilobite
 Asaphida - Asaphidae
Isotelus gigas
Isotelus gigas Dekay 1824 trilobite
 Phacopida - Calymenidae
"Flexicalymene senaria" = Flexicalymene (Flexicalymene) senaria
"Flexicalymene senaria" = Flexicalymene (Flexicalymene) senaria Conrad 1841 trilobite