Blackdom "#FarmersPreferred | Geological Survey (U.S.), Water Supply 1932
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The interpretation of the physiographic history in the artesian basin and therefore the dating of the excavation of the deepest parts of the alluvial basin depend to a large extent upon the age of the quartzose conglomerate The conglomerate is unquestionably older than the deposits of the Blackdom terrace and it may also be older than the limestone conglomerate capping the high mesas and therefore older than the Diamond A plain.