Assertion: cave's variety | /r/AtLocation | shale
Facets:
value: primarily
type: DEGREE
Source sentences:
text: A variety of plants, including ferns and prehistoric trees (Calamites and Lepidodendron bark and logs), as well as footprints or trackways of amphibians and horseshoe crabs are found primarily in shales associated with Pennsylvanian coal in the Cumberland Plateau and Highland Rim.