all images by R.J. Varga
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Parallel folds at Calico Ghost
Town, CA. Note change in bed length from top to bottom of fold
facilitated by interlayer slip. |
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Parallel fold showing detachment
due to crowding in core of fold. Monterey Fm., coastal CA. |
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Parallel folds in chert layers
of Monterey Fm. coastal CA. Note extension fractures perpendicular
to layers. |
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Similar fold in slates of Shoo Fly Fm.,
northern Sierra Nevada, CA. Note hinge-zone thickening of layers. |
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Similar fold in schists of Shoo Fly Fm.,
northern Sierra Nevada, CA. |
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Interlayered sandstone and shale units
w/well-developed axial-plane foliation in finer-grained layers.
Shoo Fly Fm., northern Sierra Nevada, CA. |
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Disharmonic minor folds in calc-silicate
metamorphic rocks, Mt. Morrison roof pendant, Sierra Nevada,
CA. Note that fold geometry is related to layer thickness |
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Similar folds in interlayered obsidian
and coarse-grained rhyolite of 500 yr.-old Deadman Dome flow,
Mammoth Mtn. area, eastern CA. |
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