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Gigapans

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  1. Franciscan pillow basalts crop out at the mouth of the Big Sur River in Andrew Molera State Park. The pillow basalts represent lavas erupted underwater, probably at a mid-ocean ridge or other deep-sea setting, that were scraped up onto the continent at a convergent margin. Nearby radiolarian chert indicates the deep-se...

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  2. The Inyo Crates are phreatic explosion pits, meaning that they were formed when rising magma encountered groundwater which caused the groundwater to vaporize and expand explosively. The surrounding volcaniclastic deposits lack volcanic material generated in the explosion, indicating a phreatic rather than magmatic orig...

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  3. A view upstream of Whitney Creek where it crosses Highway 97 north of Mt Shasta. Debris flows occasionallly flow down these drainages, usually in the warm summer months following intense rainfall. One such event occured in 1997 and was video recorded at this location by US Forest Service personnel. The debris flow flow...

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  4. Mono Lake is a salt water lake located east of Yosemite National Park. This easterly view was taken from the Mono Lake Visitor Center near the town of Lee Vining. The results of late Quaternary volcanism is visible across the view. The dark Black Point Volcano is across the lake in the left center. The dark island on t...

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  5. Panum Dome is a ~700 year old rhyolite dome that erupted though an earlier-formed explosion pit. Debris from the earlier explosive event was deposited in an explosion ring that encircles Panum Dome itself. The explosion ring is composed of ash, pumice fragments, and cobbles of Sierra granite and metamorphic rock. The ...

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  6. Beyond the point where tourists are alowed.

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