Assertion: calcareous sponge | /r/AtLocation | the carboniferous period
Facets:
Source sentences:
text: Calcareous sponges appear in the Carboniferous Period (about 359,000,000 to 299,000,000 years ago).
text: Calcareous Sponges appear in the Carboniferous Period (about 345 million to 280 million years ago).