This year's calendar features the Upper Falls at Amnicon Falls State Park in northwestern Wisconsin. This placid image belies the series of violent events that led to the waterfall's creation. The story begins over a billion years ago, when a rip in the continent caused lava to pour across the land surface. This rock layer was eventually buried beneath layers of sediment. An ancient fault shoved the ground skyward, exposing the hard volcanic rocks that now serve as the backdrop for the waterfall.
This photograph was taken about 90 years ago by H.R. Aldrich, one of our staff geologists. To see other old pictures of Wisconsin's timeless geology as well as scans of our old bulletins and handwritten field notebooks of Charles Van Hise, visit our historical collections at University of Wisconsin Digital Collections.
For just $7.50 (plus shipping and handling), we'll send you the 22 x 28-inch calendar rolled in a tube and ready for framing. Or stop by our office to purchase your copies. Download order form and request ES042-2013.
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Updated November 19, 2012