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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 56 (1972)

Issue: 8. (August)

First Page: 1364

Last Page: 1369

Title: Itkilyariak Formation: New Mississippian Formation of Endicott Group, Arctic Slope of Alaska

Author(s): C. G. Mull (2), M. D. Mangus (3)


The Itkilyariak Formation of Mississippian age has been recognized for at least 300 mi (480 km) along a linear trend both on the surface and in the subsurface of the northern Arctic Slope, Alaska. Typical lithologies in the formation are red and maroon sandstone, conglomerate, breccia, and limestone interbedded with maroon and greenish-gray shale and light-gray quartzitic sandstone. The Itkilyariak is gradational with the overlying Alapah Limestone of the Lisburne Group. The base of the formation is probably an unconformity. Outcrop thickness is as much as 150 ft (45 m), but over 500 ft (150 m) of redbeds in a similar stratigraphic position have been found in some wells. Irregular distribution suggests that the formation is related to the truncation of pre-Mississippian c astic rocks. The formation is thought to grade in a short distance southward to the normal marine shales and carbonates of the Endicott and Lisburne Groups, and is believed to have been deposited near the Mississippian shoreline. A Late Mississippian fauna has been collected from a surface exposure.

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