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The Permo-Triassic Sadlerochit Group is divided, in ascending order, into the Echooka Formation, Kavik Shale, Ivishak Sandstone, and Fire Creek Formation in the National Pertroleum Reserve-Alaska (NPRA). It pinches out near the Barrow area in the north and thickens to at least 2250 ft (685 m) in the Tunalik 1 well 100 miles to the southwest. The base is defined by the pre-Echooka unconformity, a transgressive surface of erosion developed on the Carboniferous Lisburne Group (Jamison et al., 1980). During a regional north-to-south regression, the Kavik Shale and Ivishak Sandstone were deposited. In general, they are characterized...

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