Assertion: aquifer's part | /r/HasAspect | minimal permeability
Facets:
Source sentences:
text: The combined thickness of these formations is more than 2,000 feet in the deep part of the Williston Basin, but the thickness of the lower Paleozoic aquifers is much less because the parts of the rocks that have minimal permeability or those that contain brine, oil, or gas are not considered to be aquifers.