Skip to Main Content
Skip Nav Destination

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 as an upward-shoaling succession of prodelta/shelfal mudstones to proximal deltaic, intertidal, and fluvial deposits. The Fire Creek Sandstone records an abandonment or transgression of the proximal, non-marine facies of the Ivishak Sandstone and return to fully marine depositional conditions. This work subdivides the Sadlerochit Group into lithofacies that characterize the wide range of depositional environments. The primary focus is on the Ivishak Sandstone cored in the JW Dalton, Drew Point, and East Simpson 1 wells.

You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

or Create an Account

Close Modal
Close Modal