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Swauk Formation Geological Map | by brewbooks
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Swauk Formation Geological Map

Swauk Formation (middle and early Eocene) Divided into:

Tss = Sandstone

Tsc = Conglomerate facies (middle and early Eocene)

Pink squares are Teanaway Dike Swarm

Also

Qa = Alluvium (Holocene and Pleistocene)

Ingalls Tectonic Complex (Early Cretaceous or Late Jurassic)

KJis = Foliated and massive serpentinite and serpentinized meta-peridotite

 

A small snippet from:

GEOLOGIC MAP OF THE SNOQUALMIE PASS 30×60 MINUTE QUADRANGLE, WASHINGTON

By R.W. Tabor, V.A. Frizzell, Jr., D.B. Booth, and R.B. Waitt 2000

 

pubs.usgs.gov/imap/i2538/i2538.pdf

 

The related pamphlet is pubs.usgs.gov/imap/i2538/i2538pamph.pdf

 

www.flickr.com/photos/38427292@N00/6201862373/

swauk1

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Uploaded on October 3, 2011