Assertion: shale gas | /r/HasProperty | distributed over larger area
Facets:
value: generally
type: DEGREE
value: much
type: DEGREE
Source sentences:
text: It is classified as ‘unconventional’ because it is found in shale, a less permeable rock formation than sandstone, siltstone or limestone in which ‘conventional’ gas is found, and it is generally distributed over a much larger area.