Assertion: eurypterid | /r/HasProperty | river-living
Facets:
value: during the two periods
type: TEMPORAL
Source sentences:
text: In 1913 appeared the first extensive discussion of the habitat of the eurypterids in a paper entitled "Early Palaeozoic Delta Deposits of North America" by Professor Grabau, in which he brings forward arguments for the fluviatile habitat of these merostomes in the Ordovicic and Siluric of North America, and he includes a summary of the distribution and occurrence of the eurypterids by myself, reviewing the evidence and coming to the conclusion that the eurypterids were river-living at least during the two periods mentioned.
text: The only possible conclusion seems to be that the eurypterids and the black muds both were brought by rivers from the land, i.e., that the eurypterids were river-living organisms.