Assertion: aquifer | /r/MadeOf | substantial secondary porosity
Facets:
value: mainly
type: DEGREE
Source sentences:
text: Although primary porosity and permeability in the Minnelusa aquifer occur where the aquifer consists mainly of sandstones, substantial secondary porosity and permeability occur where the aquifer consists mainly of carbonate rocks (dolomite and limestone) and calcium sulfate rocks (gypsum and anhydrite).