IOWA GEOLOGICAL & WATER SURVEY 2013 SPRING FIELD TRIP
Exposure of Pennsylvanian sandstone within the White Breast Recreation Area.
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.
Additional recent news articles and publications from the Iowa Geological & Water Survey are also available in digital format.