Assertion: eurypterid | /r/CapableOf | descend to the sea
Facets:
value: from the rivers
type: LOCATION
value: in the mid-paleozoic
type: TEMPORAL
Source sentences:
text: Chamberlin's hypothesis is to the effect that "the fish and the eurypterids descended from the rivers to the sea in the mid-Paleozoic, though their remote ancestors may have ascended from it," and the principal argument in its support is found in the claim that "there is only one conspicuous type that is facilely suited to free life, independent of the bottom, in swift streams, and that is the fish form"; it is further urged that "this could have developed only in water that possesses a persistent and usually rather rapid motion in a fixed direction, i. e., in rivers.