Measured sections and correlations of mid-Cretaceous rocks near the Lombard thrust of the Helena Salient in southwestern Montana
Open-File Report
95-841
By: T. S. Dyman, R. G. Tysdal, K.W. Porter, and G. A. Thompson
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Abstract
Two surface sections that generally characterize mid-Cretaceous strata in the central to southern part of the Helena salient of the Montana thrust belt (Figs. 1 and 2) are presented here. We have not published detailed descriptions of the lithic units of these sections, and the stratigraphic correlations are tentative. The sections are presented in this preliminary form because they may aid interpretations of seismic and borehole data of petroleum exploration companies active in the salient.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Measured sections and correlations of mid-Cretaceous rocks near the Lombard thrust of the Helena Salient in southwestern Montana |
| Series title | Open-File Report |
| Series number | 95-841 |
| DOI | 10.3133/ofr95841 |
| Year Published | 1995 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Description | 8 p. |
| Country | United States |
| State | Montana |
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