Graduate Thesis Or Dissertation
 

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  • Devonian carbonate rocks of the southern Hot Creek Range reflect a shift to the east of the carbonate shelf edge and a progressively deeper-water lithotope from late Early Devonian to early Middle Devonian time. Lower Devonian mudstones of the McColley Canyon Formation were deposited on an open shelf, dolomitized, and then flooded after gronbergi Zone time. As the sea transgressed eastward, a slope-basin lithotope developed. This deepening event is reflected in the hemipelagic deposition of the Middle Devonian Denay Limestone. Rapid flooding occurred during the Middle varcus Subzone with the onset of the Taghanic onlap. Pelletal and bioclastic-rich allodapic limestones represent distal deposition from turbidity currents originating on a slope to the east. A brief shallowing event is reflected in the rock succession at Empire Canyon and probably occurred in Interval 27, dengleri Zone. No Upper Devonian rocks have been identified in the southern Hot Creek Range or in the Warm Springs area. Deep-water deposition resumed in the Mississippian. A rising Antler highland in the west provided sediments to a foreland trough during the Early Mississippian. Conodonts from the Warm Springs area were dated to range across the Kinderhookian-Osagean boundary, from the isosticha-Upper crenulata Zone into the typicus Zone. Allodapic mudstones to detrital quartz packstones, deposited in a submarine fan complex, represent distal turbidity currents originating to the west and ponding in the trough. The stratigraphy of the southern Hot Creek Range has not been disrupted by the Roberts Mountains thrust. The limestones suggest deposition in a deepening marine lithotope as the carbonate shelf edge migrated to the east. Apparently, the Roberts Mountains allochthon progressed no farther east than the Dobbin Summit area in the central Monitor Range.
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file details Plate8.jpg 2017-10-25 Public Download