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California > E Bay > Sibley Volcanic Regio…
Foggy morning!
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Fog burning off over the hills.
Sign #1: "dark basalt dike, a feeder of lava to the crater, that cuts through a sequence of tuffbreccias (grayish brown) and pebbly mudstones (light gray), inside and near the crater bottom."
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Amy Dertz
Sep 18, 2017 near Orinda, CA
“Foggy morning!”  

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Nearby Photos

Foggy morning!
Sign #1: "dark basalt dike, a feeder of lava to the crater, that cuts through a sequence of tuffbreccias (grayish brown) and pebbly mudstones (light gray), inside and near the crater bottom."
Sibley Volcanic Regional Preserve
Junonia coenia (Common Buckeye)
EBMUD Water Tank
Sibley's Geological Treasures
View from the Water Tank
Fog burning off over the hills.
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