Geochronometric and lead isotope data on samples from the Wallace 1 degree by 2 degrees Quadrangle, Montana and Idaho
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Abstract
Most of the bedrock in the Wallace quadrangle belongs to the Belt Supergroup, a thick (about 18,000 m) sequence of generally fine-grained clastic and carbonate rocks of Middle Proterozoic age. Regional metamorphism prior to Cambrian time prograded the Belt rocks to greenschist facies, and some metal-bearing veins were emplaced in fractures. The Belt rocks were intruded in Late Proterozoic time by basic dikes and sills.
Study Area
Publication type | Report |
---|---|
Publication Subtype | USGS Numbered Series |
Title | Geochronometric and lead isotope data on samples from the Wallace 1 degree by 2 degrees Quadrangle, Montana and Idaho |
Series title | Miscellaneous Field Studies Map |
Series number | 1354 |
Chapter | G |
DOI | 10.3133/mf1354G |
Year Published | 1984 |
Language | English |
Publisher | U.S. Geological Survey |
Description | 31.43 x 41.26 inches |
Country | United States |
State | Idaho, Montana |
Scale | 250000 |
Google Analytic Metrics | Metrics page |