The Iniskin-Tuxedni region, on the west side of Cook Inlet, Alaska, is an area of about 710 square miles between Iniskin Bay and Tuxedni Bay.

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Surticial deposits, primarily of late Pleistocene and Holocene age, cover about 60 percent of the Iliamna quadrangle, which is in southwestern Alaska. The deposits are thickest in the western part, where bedrock is mostr ly covered, In the mountainous eastern part the surface is largely bedrock, but unconsolidated surficial materials occur locally. The surficial deposits are primarily the result of glaciation, with subsequent modification by glaciofluvial, lacustrine, and marine processes. The oldest deposits are correlated with the Mak Hill Glaciation of early Wisconsin age. The glaciers coalesced to form a piedmont lobe that covered much of the quadrangle during the herein newly named Kukaklek Stade. The deposits are found only on hilltops 600-1,000 feet above deposits of the next glaciation in the western part of the quadrangle. Most of the surficial materials, as well as the present topography of the quadrangle, resulted from four stades of the Brooks Lake Glaciation that are correlated with the late (classical) Wisconsin Glaciation of the conterminous United States. During the two oldest stades, herein named the Kvichak and Iliamna, the glaciers coalesced to form piedmont lobes that covered most of the quadrangle; Iliarnna Lake and other large lake basins were formed. The two youngest stades, Neiwhalen (new) and Iliuk, were minor glacial advances of the alpine valley glacier type. Moraines of the Iliuk Stade locally divide lake basins into two parts. Two stades of the Alaskan Glaciation, of Holocene age, are recognized in the quadrangle. Glaciers of the Tustumena Stade advanced 1-3 miles from the cirques, and locally three advances can be mapped. During the subsequent Tunnel Stade the ice rarely advanced more than 1 mile beyond the cirque threshold. The small modern glaciers are remnants of the Tunnel Stade. Iliamna Lake, originally dammed by a moraine of the Kvichak Stade, attained its present size and shape when dammed by a morine of the Iliamna Stade; i t formed major terrace levels a t above 40, 80, 100, and 130 feet above the present lake level. The highest stand of water was about 150 feet above the present level. Radiocarbon-dated beach deposits indicate that the 80-foot level was formed a t least 8,520 years ago. An intermediate 53-foot level was formed about 5,520 years ago. Elevated marine beach deposits and wave-cut bedrock platforms along the west coast of Cook Inlet indicate that the coast is rising. Radiocarbondated material from one locality a t Kamishak Bay suggests that the rate of uplift is about 2 feet per century.

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Reconstructs glacial history of the area (approx. 68-69 30 N, 147-162 W) on the basis of observations during 1944-1953 of the nature and extent of glacial deposits in the central part of the Range between Shainin and Itkillik Lakes and in the southern part of the Foothills Province from the Shaviovik River west to Etivluk River. Distribution is mapped and characteristics described of deposits from six glaciations for which a tentative chronological sequence is established: Anaktuvuk and Sagavanirktok of Pre-Wisconsin age; Itkillik and Echooka of Early Wisonsin; Alapah Mountain of Late Wisconsin; and Fan Mountain of Recent age. Terrace deposits and Pleistone alluviations are mentioned.