Assertion: geologist | /r/CapableOf | use fossil
Facets:
value: to date sedimentary rock layers
type: PURPOSE
value: previously
type: TEMPORAL
value: to date sections of rock
type: PURPOSE
Source sentences:
text: Previously, geologists could only use fossils and stratigraphic correlation to date sections of rock relative to one another.
text: Geologists use fossils to date sedimentary rock layers by knowing that organisms live short spans of geologic time, the rock layer where the organism was found can be dated accurately.