地质学
古水流
出处
相
河流
漫滩
碎屑岩
沉积岩
冲积扇
冲积层
地球化学
地貌学
沉积(地质)
古生物学
沉积物
构造盆地
标识
DOI:10.1016/0037-0738(84)90088-5
摘要
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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