Ferguson Hill section, Unit 86, 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 86 (total thickness: 70cm)

• bed-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; lithified, gray, calcareous siltstone and lithified, shelly/skeletal, silty lime mudstone

• 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 calcareous siltsone with white speckles; silty bioclastic mudstone/wackestone, up to 70% siliciclastics

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 76609: 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
  -
Echinodermata indet.
Bivalvia
 Pectinida - Pectinoidae
Chlamys sp.
Chlamys sp. Röding 1798 scallop
 Lucinida - Lucinidae
Mesomiltha sp.
Mesomiltha sp. Chavan 1938 clam
 Nuculida - Nuculidae
Nuculoma sp.
Nuculoma sp. Cossmann 1907 nut clam
Cephalopoda
 Ceratitida - Arcestidae
"Arcestes nevadanus" = Proarcestes nevadanus
"Arcestes nevadanus" = Proarcestes nevadanus Hyatt and Smith 1905 ceratite
Deuteropoda
  -
Ostracoda indet.
Ostracoda indet. Latreille 1802 ostracod
Foraminifera
 Foraminiferida -
"Foraminiferida indet." = Foraminifera
"Foraminiferida indet." = Foraminifera Eichwald 1830 foram