Lower part of Nowata Shale exposed during construction at I-70 and Hwy N in St. Louis

A portion of the Nowata Shale exposed in St. Louis during highway
construction at I-70 and Highway N in the summer of 2002. The hammer
rests on gray mudstone, and the pick head lies on a thin bed of
carbonaceous shale. Between them is a light greenish gray claystone
paleosol. These beds are a product of terrestrial sedimentation during
a sea level lowstand. Glaciers covered much of the high latitudes at
this time.

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