This picture is of a set of crinoid pentagon shaped fossils that once made up a column. They existed in the Mississippian Period. The fossils were found in Carwood Formation (part of the Borden Group) of Washington County, Indiana USA.
There are also a few impressions of brachiopods and near the bottom left corner a spiral shape that I am not sure what kind of creature it belonged to.
Thanks to Kenny for the picture.
