Abstract
Grain-size distributions and sedimentary structures of Tertiary strata along Kachemak Bay indicate a variety of inchannel and overbank fluvial facies. A Markov analysis indicates cyclicity of these facies, probably caused by repeated and regular channel migration during subsidence. Fossils indicate a cool-temperate climate and probable freshwater deposition. Paleocurrent directions and sandstone composition suggest a metamorphic and sedimentary-clastic provenance during Homerian time with the addition of pyroclastics during Clamgulchian time. The Homerian Stage beds represent facies of braided-meandering streams whereas the Clamgulchian Stage beds represent facies of meandering streams. These streams flowed westward and northwestward from the Chugach-Kenai Mountains onto wooded, low-gradient, alluvial plains.
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