Assertion: horse's family | /r/HasProperty | remnants of a group
Facets:
Source sentences:
text: These families are remnants of a group that flourished during the Paleogene and Neogene periods (from 65.5 million to 2.6 million years ago), a time when it was much richer in species and in variety of form than at present and played a dominant role in the fauna of the world.