Assertion: gypsum | /r/HasProperty | selenite crystals
Facets:
value: chiefly
type: DEGREE
value: near the upper contact
type: LOCATION
Source sentences:
text: Near the upper contact the gypsum is composed chiefly of selenite crystals, locally interfingering with grayish-green shale that resembles the overlying shale (Pl. 20A).