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View of the Lewis Thrust

View on map:48.729444°N 113.465278°W

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Lewis thrust
48.729324°N 113.465464°W
The Lewis thrust is below the white cliffs.  If you climb the hill you will be able to see Divide Mountain to the right which is almost a klippen.  The Lewis thrust places "far-traveled Belt Supergroup rocks over the Late Cretaceous Two Medicine Formation".  See the image.  Stop 12 of Sears et al. 

Description


Lewis Thrust

The green lines show approximately where the thrust fault is.

The Lewis Overthrust is a geologic thrust fault structure of the Rocky Mountains found within the bordering national parks of Glacier in Montana, United States and Waterton Lakes in Alberta, Canada. The structure was created due to the collision of tectonic plates about 170 million years ago that drove a several mile thick wedge of rock 50 mi (80 km) eastwards, causing it to overlie softer Cretaceous age rock that is 400 to 500 million years younger.

References

  • Page 241 - Sears, J. W. et al., 2016, Transect across the northeastern margin of the Mesoproterozoic Belt Basin and Lewis thrust, Glacier National Park, Montana: Geol. Soc. Am. Field Gude 44, p. 231 - 245.
  • https://en.wikipedia.org/wiki/Lewis_Overthrust
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