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Publication Citation
| USGS Series | Professional Paper |
|---|---|
| Report Number | 1657 |
| Title | Composition, age, and petrogenesis of Late Cretaceous intrusive rocks in the central Big Belt Mountains, Broadwater and Meagher counties, Montana |
| Edition | - |
| Language | ENGLISH |
| Author(s) | Du Bray, E. A.; Snee, L. W. |
| Year | 2002 |
| Originating office | |
| USGS Library Call Number | - |
| Physical description | 30 p. |
| ISBN |
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Abstract
Cretaceous intrusions hosted by the Proterozoic Newland Formation. The northern intrusion, centered on Boulder Baldy, consists of outer, intermediate, and core zones composed of aegirine-augite quartz monzonite, hornblende quartz monzodiorite, and biotite granodiorite, respectively. The southern intrusion, north of Mount Edith, is compositionally indistinguishable from the intermediate zone of the northern intrusion.
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