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Geology Club Hike: Point Reyes 2008

SRJC Geology Club members on Nov. 23, 2008

Point Reyes Conglomerate

There's pillow lava in them thar hills...

Bio-cr@p obscuring the view of Nicasio Dam pillow lava

Mid Tomales Bay

There is a nonconformity waiting for us down there...

McClures Beach trailhead prep.

Perfect beach weather; albeit somewhat windy and cool.

Sedimentary breccia composed mostly of Salinian granodiorite

The rest of the group comes down the trail.

A dike in a mass of aplite

Here's that nonconformity...

The metamorphic base is garnet- and sillimanite-bearing quartzofeldspathic gneiss and granofels

nonconformity
1. n. [Geology]

A geological surface that separates younger overlying sedimentary strata from eroded igneous or metamorphic rocks and represents a large gap in the geologic record.

Gneiss and granofels

Cross-bedded sand layers

Trail down to McClures Beach

Looking south-west

Point Reyes Beach from the Lighthouse Visitor Center parking lot

Graded turbidite beds

More turbidites

We like our turbidites

Really nicely graded, turbidite beds

...interbeds
of fine-grained, laminated sandstone and mudstone

purple porphyry clasts?

Pt. Reyes Lighthouse

The view south from the Lighthouse

Only 307 steps to go...

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