Calamites cisti

This unusual specimen is a cast of the pith cavity of a small calamites cisti stem, showing a single branch attached. Note the branch shows the same ribs and nodes as occur on the main stem.


Rock Type: Sandstone; fine-grained
Formation: Kanawha
Interval: Coalburg seam
Age: Middle Pennsylvanian Period, approx. 307 million years.


Location: Nicholas County, West Virginia; Ramp Run Surface Mine #1, located about 12 miles north of Summersville, West Virginia. Turn west off route 19 north of Summersville onto Spruce Run Road.