Klintar: Ancient Marine Reefs of the Wabash Valley (GM-17)
The Wabash Valley klintar were formed in Silurian seas that covered the area more than 400 million years ago. Later deposition buried them to unknown depths. After regional uplift, weathering and erosion removed overlying strata, and parts of these ancient reefs were gradually exposed. Rock materials left behind by Ice Age glaciers reburied many of these reefs, and some of them were again partly exposed by postglacial erosion. Hanging Rock near Largo is a klint. Several limestone quarries in or near the Wabash Valley produce reef rock for aggregate.
Our Hoosier State Beneath Us: Geomorphology