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breccia Titus Canyon Death Valley, California

breccia Titus Canyon Death Valley, California

Here we have a fold found along a trail in Strawberry Canyon just east of the University of California, Berkeley and the Hayward fault.

Here we have a fold found along a trail in Strawberry Canyon just east of the University of California, Berkeley and the Hayward fault.

Friday fold: cherts at Mount Diablo, California My former student James O’Brien recently moved out to the left coast, and posted some photos earlier this week of a hike he took at Mount Diablo State Park in the mountains east of the San Francisco Bay area of California.  There are some classic-looking Franciscan cherts exposed there, as these folded examples show:  #ScienzeGeologichePage

Friday fold: cherts at Mount Diablo, California My former student James O’Brien recently moved out to the left coast, and posted some photos earlier this week of a hike he took at Mount Diablo State Park in the mountains east of the San Francisco Bay area of California. There are some classic-looking Franciscan cherts exposed there, as these folded examples show: #ScienzeGeologichePage

Here we have a fold found along a trail in Strawberry Canyon just east of the University of California, Berkeley and the Hayward fault.

Here we have a fold found along a trail in Strawberry Canyon just east of the University of California, Berkeley and the Hayward fault.

Fault slickensides, Mecca Hills, Riverside County, California    A minor right-lateral fault exposed along Hwy 195 about 7 km (4 mi) northeast of the San Andreas fault. Even though this is a minor fault, the fault exposure is quite large and impressively well preserved.

Fault slickensides, Mecca Hills, Riverside County, California A minor right-lateral fault exposed along Hwy 195 about 7 km (4 mi) northeast of the San Andreas fault. Even though this is a minor fault, the fault exposure is quite large and impressively well preserved.

Ignimbrite | Bolton's website

Ignimbrite | Bolton's website

Maybe weathering is the key: So the story recorded here could therefore be: lava erupts, lava cools to basalt, basalt weathers from the top down, producing clay and rust-rich saprolite, new lava erupts, cooks weathered basalt beneath, baking it orange.

Maybe weathering is the key: So the story recorded here could therefore be: lava erupts, lava cools to basalt, basalt weathers from the top down, producing clay and rust-rich saprolite, new lava erupts, cooks weathered basalt beneath, baking it orange.

Slickensides along the Calaveras Fault

Slickensides along the Calaveras Fault

There’s something about conglomerates that just draws me in. Here’s a lovely example — you might even say it’s an exemplar — from Sandy Hollow in Montana:

There’s something about conglomerates that just draws me in. Here’s a lovely example — you might even say it’s an exemplar — from Sandy Hollow in Montana:

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