Assertion: oyster's shell | /r/HasProperty | traded
Facets:
value: from the gulf of mexico
type: LOCATION
value: each year
type: TEMPORAL
Source sentences:
text: No one is sure how many shells are traded each year, though it’s thought that around 5000 species of mollusk are targeted.
text: Shells such as marginella and olivella shells were traded from the Gulf of Mexico and the coasts of California into the Plains since 100 CE.