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Unformatted text preview: Ma • Colombia River Basalt (olivine) 10 m • Grande Ronde Westward flow Bristol Quarry Kellie • Top layer is large conglomerate formed by very high energy river • Middle layer = Large course sandstone (hot 9 m • Sediment Source = Cascade(s) • River environment Eastward flow Faulting Landslides Normal Faults (2 meters of uplift) Lehar) • Bottom layer = Bedded fine grain sandstone with Rhyolite • Bed layers differentiated by chances in grain size Blueschist = low grade morphology Roslyn formation ~55 Ma • Course- medium grain sandstone (quartz, biotite, plagioclase) • Mudstone • Organic laminated layers 12 m • Idaho Batholith (granite) • High energy river deposits sandstone • Mudstone deposited during “over bank” Southward flow Cross bedding Fossil leaves Turtle skull Unconformity between Roslyn and Kellie *Row height/thickness does not indicate relative thicknesses of bed layers or formations...
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- Spring '09
- Geology, Grande Ronde, flow Southward flow, Pillow Basalts Grande Ronde Flow, Eastward flow