Assertion: eurypterid's life | /r/HasProperty | occasional
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Source sentences:
text: The association of eurypterids and fishes in the Old Red sandstone where marine life was only occasional and meagre does not, as Chamberlin points out, imply prevalent marine conditions, for the Old Red and its homologues are the deposits of fresh water, and yet both the fishes and eurypterids found congenial conditions of life there.