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
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.