Geologists know well that Iowa used to teem with marine life, as it once was under water.

But University of Iowa engineers and construction crews last week got a reminder when they dug up 385 million-year-old coral fossils while working on an expansion to the Seamans Center on campus.

Crews were drilling about 35 feet deep last Tuesday when they ran into rocks belonging to the Coralville Formation, which existed during the Devonian period of geologic time, according to Ryan Clark, a geologist with the Iowa Geological Survey. Iowa, at that time, sat near the equator under a warm, shallow sea, according to Clark.

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Cedar Rapids Gazette