Old Beach, New Beach - Falls Park EarthCache
Old Beach, New Beach - Falls Park
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The pink quartzite exposed at Falls Park in Sioux Falls, South Dakota was laid down between 1.6 and 1.7 billion years ago (Proterozoic Era) along a shallow sea margin. The formation is known as the Sioux Quartzite, blocks of it can be found as far away as central Kansas having been deposited there during the Pleistocene glaciation. The sand grains that make up the quartzite were eroded from the Penokean Mountains located in the late Precambrian Minnesota. Look for ripple marks left behind on the ancient sea bed.
To get credit for this cache, post a picture of yourself standing next to a set of ripple marks with the old mill in the background and e-mail me the answer to the following question:
What type of rock are the walls of the old mill built from?
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