Geochronometric and lead isotope data on samples from the Wallace 1 degree by 2 degrees Quadrangle, Montana and Idaho
Miscellaneous Field Studies Map
1354-G
By: R. F. Marvin, R. E. Zartman, J. D. Obradovich, and J. E. Harrison
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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.
Suggested Citation
Marvin, R.F., Zartman, R., Obradovich, J.D., Harrison, J.E., 1984, Geochronometric and lead isotope data on samples from the Wallace 1 degree by 2 degrees Quadrangle, Montana and Idaho: U.S. Geological Survey Miscellaneous Field Studies Map 1354, 31.43 x 41.26 inches, https://doi.org/10.3133/mf1354G.
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 |