Ordovician and middle Silurian rocks of the Wildhorse window, northeastern Pioneer Mountains, central Idaho
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Abstract
Along Wildhorse Creek in the northeastern Pioneer Mountains, autochthonous Ordovician and Silurian rocks of an eastern carbonate assemblage are exposed in a structural window through allochthonous flysch deposits of the Mississippian Copper Basin Group. Graptolite-bearing Middle and Upper Ordovician dolomite and cherty dolomite 210 ft (64 m) thick are lithologically and faunally similar to the Hanson Creek Formation of central Nevada and the Saturday Mountain Formation of central Idaho. Monograptus-bearing Middle Silurian platy limestone at least 130 ft (40 m) thick resembles the Roberts Mountains Formation of central Nevada and rocks improperly designated Trail Creek Formation in the Bayhorse region of central Idaho. Allochthonous age-equivalent units of a more western transitional assemblage (the type Phi Kappa and Trail Creek Formations) occur 5 mi (8 km) west of the Wildhorse window, along the crest of the Pioneer Mountains.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Ordovician and middle Silurian rocks of the Wildhorse window, northeastern Pioneer Mountains, central Idaho |
| Series title | Journal of Research of the U.S. Geological Survey |
| Volume | 3 |
| Issue | 4 |
| Year Published | 1975 |
| Language | English |
| Publisher | U. S. Geological Survey |
| Description | 6 p. |
| First page | 431 |
| Last page | 436 |
| Country | United States |
| State | Idaho |
| Other Geospatial | Pioneer Mountains, Wildhorse window |
| Google Analytic Metrics | Metrics page |