Thursday, October 15, 2009

Eridotrypa Bryozoan

Devonian Period bryozoan colonies called Eridotrypa. These fossils were found in Speed Limestone in Clark County, Indiana. The first fossil shown looks like something was boring into it.

A neat thing to show people is that some of these fossils will float in water. I suppose the small bodied creatures decomposed leaving air pockets. This porous structure is light enough to float until the cavities eventually flood.