Ferguson Hill section, Unit 85, New York Canyon area (Triassic of the United States)

Where: Mineral County, Nevada (38.5° N, 118.1° W: paleocoordinates 18.1° N, 55.7° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Mount Hyatt Member (Gabbs Formation), Rhaetian (208.5 - 201.3 Ma)

• upper part of Mount Hyatt member; latest Rhaetian; unit 85 (total thickness: 83cm)

• bed-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; lithified, gray limestone

• depositional paleoenvironments at Ferguson Hill section were all normal marine environments below wave base, these strate were thus deposited as part of a shelfal terrane along a subsiding continental margin in which there was significant variation in subsidence rates. According to Laws (1982) and Taylor et al. (1983), the sediments of the Gabbs Fm. were deposited in a shallow marine environment, they concluded that the upper part of the Mt Hyatt member represents the lower shoreface. Taylor et al. (2000) and Taylor & Guex (2002) interpreted the upper part of the member to be mid-shelf.
• medium dark gray limestone, weathers dark yellowish orange

Size classes: macrofossils, microfossils

Collection methods: bulk, peel or thin section,

Primary reference: S. G. Lucas, D. G. Taylor, J. Guex, L. H. Tanner, and K. Krainer. 2007. The proposed global stratotype section and point for the base of the Jurassic system in the New York Canyon area, Nevada, USA. New Mexico Museum of Natural History and Science Bulletin (40)139-168 [M. Aberhan/S. Nurnberg/S. Nurnberg]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 76608: authorized by Martin Aberhan, entered by Sabine Nürnberg on 26.11.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• focus on ammonoids and bivalves
Show authors, comments, and common names
unclassified
  -
Chordata indet.
Chordata indet. Haeckel 1874
ichthyoliths
Conodonta
  -
Conodonta indet.
Cephalopoda
 Ceratitida - Choristoceratidae
Choristoceras crickmayi, Choristoceras shoshonensis
Choristoceras crickmayi Tozer 1979 ceratite
Choristoceras shoshonensis Taylor and Guex 2002 ceratite
 Ceratitida - Arcestidae
Arcestes gigantogaleatus
Arcestes gigantogaleatus von Mojsisovics 1875 ceratite
 Phylloceratida - Discophyllitidae
Rhacophyllites cf. debilis
Rhacophyllites cf. debilis Hauer 1846 ammonite
Bivalvia
 Nuculida - Nuculidae
Nuculoma sp.
Nuculoma sp. Cossmann 1907 nut clam
 Cardiida - Cardiidae
Septocardia sp.
Septocardia sp. Hall 1877 cockle
 Lucinida - Lucinidae
Mesomiltha sp.
Mesomiltha sp. Chavan 1938 clam
unclassified
  -
Porifera indet.
Porifera indet. Grant 1836
spicules
Protozoa
  -
Radiolaria indet.
Foraminifera
 Foraminiferida -
"Foraminiferida indet." = Foraminifera
"Foraminiferida indet." = Foraminifera Eichwald 1830 foram