While at work last week, I was working up on the roof of the building and found that it was covered in small river pea gravel. A quick look at the gravel and I found two fragments of horn coral fossils (first two pictures). The last picture shows either a bryozoan or colonial coral fossil. The building is located in Louisville, Kentucky and was built in the 1970s. It is a good assumption the gravel was dredged from the Ohio River.
