Assertion: principal aquifer | /r/HasProperty | the crag
Facets:
Source sentences:
text: The maps only consider the principal aquifers, namely: the Crag; Chalk; Lower Greensand; Spilsby Sandstone; Corallian Limestone; Oolites; Triassic sandstone; Magnesian limestone; Permian sandstone; Carboniferous Limestone and the Fell Sandstone and Border Group.