Section 4/Locality 11251 (Triassic of the United States)

Where: Nye County, Nevada (38.9° N, 117.6° W: paleocoordinates 10.4° N, 46.5° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Luning Formation, Carnian (237.0 - 228.0 Ma)

• The Luning Formation is a remnant of a tectonically dismembered Lower Mesozoic carbonate platform complex exposed in scattered ranges throughout west-central Nevada. It rests unconformably upon different, often unamed, Late Paleozoic and Triassic units in each outcrop, but is regoinally overlain by the Upper Triassic through Lower Jurassic Gabbs and Sunrise Formations.

• group of beds-level stratigraphic resolution

Environment/lithology: basinal (); lithified wackestone

• The lowest, clastic member consists of 250m of chert pebble conglomerates, silty sandstones, and argillites. Except for rare fragments of petrified wood, these sediments are without fossils. The shaly limestone and calcareous shale members, each 200m thick, overlie the clastic unit. These are formed of interbedded silty and shaly limestones, limey shales, mudstones, and claystones, and contain a rich fossil component. The upper most carbonate member is a 400m thick sequence of comparatively silt- and clay-free limestones and secondary dolomites. This unit is also characterized by an abundance of fossils. The upper, fossi-bearing members of the Luning Formation are the focus of this report.

Size class: macrofossils

Reposited in the UCMP

Collection methods: bulk,

Primary reference: J. A. Hogler. 1992. Community structure, paleoecology, and depositional environments within the Upper Triassic Luning Formation of Nevada. [D. Bottjer/N. Bonuso/N. Bonuso]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 32758: authorized by David Bottjer, entered by Nicole Bonuso on 14.07.2003, edited by Wolfgang Kiessling

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Gastropoda
  -
Gastropoda indet.
Gastropoda indet. Cuvier 1795 snail
Snail A
Bivalvia
 Ostreida - Ostreidae
Umbrostrea montiscaprilis
Umbrostrea montiscaprilis Klipstein 1843 oyster
 Trigoniida - Myophoriidae
Costatoria sp.
Costatoria sp. Waagen 1907 clam
 Nuculanida - Nuculanidae
Nuculana sp.
Nuculana sp. Link 1807 pointed nut clam