Assertion: anthracite | /r/AtLocation | deformed areas
Facets:
value: such as in the intensely folded sedimentary
type: LOCATION
value: geologically
type: MANNER
value: usually
type: TEMPORAL
Source sentences:
text: Although anthracites usually occur in geologically deformed areas, such as in the intensely folded sedimentary rocks of the anthracite region of Pennsylvania, U.S., their origin is due to higher than normal heating caused by the presence of nearby igneous intrusions or high geothermal gradients.