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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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Sibley's Geological Treasures
EBMUD Water Tank
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Wendy Wheeler
Jun 3, 2018 near Orinda, CA
“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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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."
EBMUD Water Tank
View from the Water Tank
Fog burning off over the hills.
Rolling grass hills
Junonia coenia (Common Buckeye)
Sibley Volcanic Regional Preserve
Sibley's Geological Treasures
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