Assertion: aquifer | /r/HasProperty | three separate formations
Facets:
value: at sandstone
type: LOCATION
value: at dolomite
type: LOCATION
Source sentences:
text: The aquifer is composed of three separate formations – the Jordan Sandstone (Cambrian age) at the bottom, dolomite and sandstone of the Prairie du Chien Group in the middle (Ordovician age), and the St. Peter Sandstone at the top.