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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:
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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.

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Additional publication details

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
Year Published:
1995
Language:
English
Publisher:
U.S. Geological Survey
Description:
8 p.
Country:
United States
State:
Montana