Assertion: echinoderm | /r/CapableOf | enter the fossil record
Facets:
value: in the early cambrian
type: TEMPORAL
Source sentences:
text: Echinoderms with mineralized skeletons entered the fossil record in the early Cambrian (540 mya), and during the next 100 million years, the crinoids and blastoids (also stalked filter-feeders) were dominant.