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IOWA GEOLOGICAL & WATER SURVEY 2013 SPRING FIELD TRIP --NEW--

The Iowa Geological & Water Survey will be leading its Spring 2013 Field Trip to a spectacular series of Pennsylvanian exposures. The trip will take place within the White Breast Recreation Area on the shores of Lake Red Rock (Marion County) on the afternoon of April 20. Exposures include a thick sequence of sediments that were deposited in an estuary about 309 million years ago and clearly display multiple layers of cyclic tidal deposition.

IOWA METEORITE CRATER CONFIRMED

Recent USGS airborne geophysical surveys near Decorah, Iowa are providing a look at a 470-million-year-old meteorite crater concealed beneath bedrock and sediments. The Iowa Geological & Water Survey (IGWS) have been investigating this area since the early 2000’s when they encountered anomalous rocks in water well cutting samples. The feature was hypothesized as a probable meteorite crater by IGWS in 2008-09.

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The Bedrock Geologic Map of Iowa portrays the current interpretation of the distribution of various bedrock stratigraphic units present at the bedrock surface. More...

Well contractors can use the latest Well Record Form, then mail, e-mail or fax a completed form to the IGWS.