Assertion: eurypterid | /r/HasProperty | scarce
Facets:
value: in the shales
type: LOCATION
Source sentences:
text: In the present instance it is difficult to explain the presence of eurypterids as marine organisms if we account for the lithological variation in the customary manner, for it is in the sandstones which mark the dominance of terrigenous sedimentation that the eurypterids are more abundant, while they are scarce in the shales which accompany the advance of the sea.
text: Nanahughmilleria can occur in an environment where eurypterids were abundant or scarce.