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Fall 2006 This group is from the OSHER LIFELONG LEARNING INSTITUTE at the University of Minneapolis - Twin Cities campus. I've been guiding OLLIE members since about 1998.
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We typically start geology field trips with a stop at the waterfalls over the Prairie du Chien rock formation on the Vermillion River in Hasting, Minnesota.
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Dr. Paul Wieblen, Professor Emeritus, Geology & Geophysics, U of Minn, has led dozens of geology trips and sometimes asks ArcheoPaleo to come along to discuss the fossils...
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A major stop on any southeastern Minnesota field trip is the spectacular geology of the Mississippi River town of Red Wing, Minnesota.
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View of upstream side of the fault block 'island' in the Mississippi River above the City of Red Wing...
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...the downstream end of 'Barn Bluff' with Wisconsin in the far horizon.
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A must see is the Goodhue County Museum on the bluff overlooking Red Wing...we held a mini-class in geology in the museum's replica of a 19th Century one-room schoolhouse...
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...then we toured the Museum's fine collections including these Paleozoic invertebrate fossil specimens. These 'sponges' are actually Receptaculites and Isadites - enigmatic colonial structures - check them out on the internet!. In the previous image, the 4 round fossils at the top of the 'brachiopod' grouping are actually gum-drop shaped bryozoans named Prasopora.
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It is a Weiblen tradition to combine rigorous geology with good food and good company...
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Another interesting stop is at the Sogn roadcut in western Goodhue County...this massive limestone of the Ordovician Era Platteville Formation includes a layer of volcanic ash (preserved as bentonite clay) which can be dated to 454 million years ago..
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...this bentonite layer was once volcanic ash from massive eruptions in the present day Appalachian Mountains some 1000 miles to the east. Carried by trade winds, it fell into the sea covering what is now Minnesota and killed every living thing in the sea in our region.
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Further on in western Goodhue County is the classic Minnesota roadcut called Wang's Corner. Here Paul points out the best fossil collection spot in the Cumminsville member of the Upper Ordovician Galena Formation - trilobites anyone?
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