Tongue River Valley near Ashland, Montana
Detailed Description
West-facing view of the Tongue River Valley near Ashland, Montana. The hills in the foreground and the bench in the middle of photo are supported by resistant clinker that was formed by the natural burning of the Knobloch coal bed in the lower Tongue River member. The plateau on the horizon is held up by clinker formed by the natural burning of the Anderson coal bed in the upper Tongue River Member.
Sources/Usage
Public Domain.