Assertion: mollusk's shell | /r/AtLocation | intertidal zone
Facets:
value: to the gulf of mexico
type: LOCATION
value: from the gulf of st. lawrence
type: LOCATION
Source sentences:
text: The dingy white shell, which is thick and rounded and has prominent concentric lines, is found in the intertidal zone from the Gulf of St. Lawrence to the Gulf of Mexico; it is the most important food clam of the Atlantic coast.