This photo, taken in Glacier Park, shows scratches on bedrock that were made as a valley (a.k.a. alpine) glacier moved across here. Large rock fragments stuck to the bottom of the ice caused the gouges, which are called "glacial striations."
How to track a glacier . . .
How far south? . . .
Below: This striation is one of many that can be found on top of Snake Butte on the Ft. Belknap Reservation in north-central Montana. The Snake Butte striations were caused by the continental glacier that grew into Montana from Canada during the most recent ice age. The orientation of the striations here indicate the glacier was flowing toward the southeast (photo) as it moved up and over Snake Butte. Furthermore, large pieces of Snake Butte transported by the glacier can be strewn along a line to the southeast of Snake Butte (photo). This "Snake Butte Boulder Train" confirms that the glacier was flowing toward the southeast as it moved through this part of the Ft. Belknap Reservation To see a much larger version of the photo below click here.
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Earth Science Teacher at Helena High School