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BASEMAPS
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WEATHER
Tuffaceous siltstone and sandstone (ORTss;0)
Geologic Formation
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Lithology
Siltstone
Sandstone
Mudstone
Geologic Age
Middle Eocene – Late Eocene (47.8 Ma – 33.9 Ma ago)
Geologic Unit Label
Tss
Thick- to thin-bedded marine tuffaceous mudstone, siltstone, and sandstone; fine to coarse grained. Contains calcareous concretions and, in places, is carbonaceous and micaceous. Includes the Nestucca Formation, which contains a foraminiferal assemblage assigned to the upper Narizian and lowermost Refugian Stages (Snavely and others, 1969; McKeel, 1980); the Spencer Formation, which contains Narizian Stage foraminifers; the Keasey Formation, which contains upper Narizian and lower Refugian Stage foraminifers (McDougall, 1975, 1980); the Coaledo and Bateman Formations of Baldwin (1974); upper Eocene sandstone of Bela (1981); and the Sager Creek formation (informal name) of Niem and Niem (1985)
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USGS
Taxonomy
Classified As
Geologic Formation
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