Fort McCoy has archaeological sites within its boundaries that represent more than 10,000 years of history.Most of the artifacts from those sites ...

The movement of groundwater through the limestone has caused formation of chert nodules. The chert is composed of silicon dioxide and is gray or whitish-gray. It forms small round or ellipitical ...

"What we encountered here was a layer of limestone called chert that was really, really dense. And the contractor had to punch through those layers oftentimes to get deeper with their foundation ...

Laminated limestone and laminated argillaceous limestone are the distal deposits of gravity flows. Calcareous mudstone and radiolarian chert were deposited from hemipelagic and pelagic suspensions and ...