How lucky we are to live in Linn County, Iowa! A bedrock map of Iowa reveals that Linn County lies at the junction of distinct landforms and geological history. So amateur geologists have at their disposal a variety of formations to examine in a relatively close area. As per the Iowa Geological Society maps (Iowa Geology # 22, 1997, page 5), two distinct bedrock formations underlie the area: Precambrian and Devonian. We will primarily be investigating Linn and northern Johnson Counties' geological past.
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