Tropic Shale

Tropic Shale
Stratigraphic range: Cenomanian to Turonian
Tropic Shale at its type location at Tropic, Utah
TypeGeological formation
Unit ofKaiparowits Plateau
UnderliesStraight Cliffs Formation
OverliesDakota Formation
ThicknessMaximum 1,450 feet (440 m), average 600 feet (180 m)
Lithology
PrimaryShale
Location
Coordinates37°37′44″N 112°04′34″W / 37.629°N 112.076°W / 37.629; -112.076
Region Utah
Country United States
Type section
Named forExposures near Tropic, Garfield County, Utah
Named byGregory and Moore, 1931[1]
Tropic Shale is located in the United States
Tropic Shale
Tropic Shale (the United States)
Tropic Shale is located in Utah
Tropic Shale
Tropic Shale (Utah)

The Tropic Shale is a Mesozoic geologic formation. Dinosaur remains are among the fossils that have been recovered from the formation,[2] including Nothronychus graffami. The Tropic Shale is a stratigraphic unit of the Kaiparowits Plateau of south central Utah. The Tropic Shale was first named in 1931 after the town of Tropic where the Type section is located.[3] The Tropic Shale outcrops in Kane and Garfield counties, with large sections of exposure found in the Grand Staircase–Escalante National Monument.

  1. ^ Geolex — Unit Summary, USGS
  2. ^ Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
  3. ^ Gregory, H.E. and Moore, R.C., 1931, The Kaiparowits region, a geographic and geologic reconnaissance of parts of Utah and Arizona: U.S. Geological Survey Professional Paper, 164, 161 p.