Sinkholes in the karst area of south-central Indiana contain, from oldest to youngest, (1) sandy calcareous mud; (2) red clay and red silt, both facies commonly known as terra rossa; (3) chert gravel; (4) loess; and (5) yellowish-brown silt derived from loess.

The nature and distribution of litho-stratigraphic units suggest the filling of bedrock basins. The terra rossa in the sinkholes is primarily a transported sedimentary deposit. The source of much of the terra rossa sediment is probably the adjacent uplands.

First Page Preview

First page PDF preview
You do not currently have access to this article.