Concretions of Montana

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Presentation Description

Watch this to learn how concretions, which are formed in sandstone, arrive at the surface.

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Presentation Transcript

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Click on the arrow inside this circle to begin. Select the “ full screen option here. Then use your keyboard to advance the slides.

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Concretions at the Rimrock Auto Arena (The METRA) in Billings, MT

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A closer look at the concretions (This photo was taken several months after the tornado of 2010.)

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Even closer (Photo taken in 1995) A B

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Concretion near Zimmerman Trail (also in Billings, Montana) C

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Same concretion that was shown on previous slide C

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Here are concretions A, B, and C. (A, B, C were shown in photos on previous slides.) A B C 70 million years ago : These are layers of sandstone with concretions embedded beneath the surface.

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B C A Millions of years later : The sandstone around the concretions has eroded away. A and B were found in soil during construction of the METRA in the 1970 ’ s.

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To learn much more about concretions, go to . . . . . . www.formontana.net/metra.html Press your “ escape key ” to close the presentation.

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