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My dad, being the science nerd he is (really...people used to say to him "Bill Rourke the Science Dork) has been explaining to me how Billings used to be underwater a long, long time ago.

The Rims that we run on (here is a little perspective) all used to be under the sea

From the bottom

From the top

All that is left is the Yellowstone River, which is running very low right now since its mostly frozen

The Rimrocks (also known as the "Rims") are a geologic sandstone formations that are located in Sections of Billings, Montana. 80 Million years ago the Billings metro area was the shore of a Sea that went from the present-day Gulf of Mexico to the Arctic North. Sediment and sand from the Sea were deposited around the shoreline. Over time the Sea rose and fell leaving behind a deep layer of Sand. Over Millions of years this sand was compressed into the stone the Rims are made of it is known as Eagle Sandstone. Around a million years ago a much larger river than the current day Yellowstone River, began cutting a canyon into the valley floor of Eagle Sandstone creating what today is known as the Rimrocks or Rims.