Links
- Document: Report (1.8 MB pdf)
- Figure: Numbered Foliation Map (505 KB pdf)
- Data Release: USGS data release - Preliminary Geology of the North Meadow Creek Area, Tobacco Root Mountains, Southwest Montana: Measurements along the North Meadow Creek Fault
- Download citation as: RIS | Dublin Core
Abstract
This report documents a previously unmapped fault, informally referred to herein as the North Meadow Creek fault, on the east flank of the Tobacco Mountains of southwestern Montana. This fault has an apparently long and complex history, including Quaternary offset of an older alluvial terrace, offset of a debris flow of presumed Pleistocene age, offset of rhyolite lava flows of presumed Tertiary age from their presumed source several kilometers east, on the opposite side of the fault, and offset and possible rotation of blocks of Archean gneiss on northeast side of the fault. The western part of the fault is covered by glacial moraines of two apparent ages, both Pleistocene.
Suggested Citation
Fuis, G.S., LeClair, P.J., and Ruleman, C.A., 2026, Preliminary geology of the North Meadow Creek Area, Tobacco Root Mountains, southwest Montana—The North Meadow Creek Fault: U.S. Geological Survey Open-File Report 2025–1058, 6 p., https://doi.org/10.3133/ofr20251058.
ISSN: 2331-1258 (online)
Table of Contents
- Acknowledgments
- Abstract
- Introduction
- Geology of the North Meadow Creek Region
- Geologic History
- Discussion
- Conclusions
- References Cited
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Preliminary geology of the North Meadow Creek Area, Tobacco Root Mountains, southwest Montana: The North Meadow Creek Fault |
| Series title | Open-File Report |
| Series number | 2025-1058 |
| DOI | 10.3133/ofr20251058 |
| Publication Date | June 18, 2026 |
| Year Published | 2026 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Contributing office(s) | Earthquake Science Center |
| Description | Report: iv, 6 p.; Data Release; 1 supplemental figure |
| Online Only (Y/N) | Y |
| Additional Online Files (Y/N) | Y |