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BASEMAPS
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Temperature
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WEATHER
Mafic and intermediate intrusive rocks (ORTim2;0)
Geologic Formation
in
OR
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Lithology
Gabbro
Andesite
Geologic Age
Miocene – Pliocene (23.03 Ma – 2.58 Ma ago)
Geologic Unit Label
Tim2
Dikes, plugs, and sills of basalt, diabase, gabbro, and lesser andesite that fed many of the Miocene basalt and andesite flows in units Tc and Tba. Some intrusions are rootless and are invasive into sedimentary sequences; includes related breccia and peperite. Includes the Monument dike swarm of northwestern Grant County (OR061), the Chief Joseph dike swarm principally in Baker and Wallowa Counties (OR093), the Steens Mountain dike swarm in Harney County (OR005; OR094; OR095) and numerous isolated intrusive bodies in southern Lake County and several intrusive masses in and near-vent flows in southern Malheur County (OR023;OR024). May also include some lower Pleistocene(?) rocks
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USGS
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Geologic Formation
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