Assertion: aquifer's part | /r/MadeOf | radioactive black shale
Facets:
Source sentences:
text: The upper part of the Minnelusa Formation "contains dolomite, anhydrite, eolian sandstone, siltstone, and cherty dolomite" whereas the lower part of the formation "consists of shale, dolomite, radioactive black shale, anhydrite, and sandstone" (DeWitt and others, 1986, p. 35).