Assertion: early cephalopod | /r/AtLocation | association
Facets:
value: with thrombolites
type: OTHER
value: usually
type: DEGREE
Source sentences:
text: In the Early Palaeozoic, their range was far more restricted than today: They were mainly constrained to sub-littoral regions of shallow shelves of the low latitudes, and usually occur in association with thrombolites.