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1/ Wednesday in the Chehalis Valley with Carie-Ann Lau, ex grad student, now session instructor EASC 411 Terrain Analysis. This weekend students will be field checking their terrain and terrain stability map. Interesting terrain types and stratigraphy. (thread) #SFUGlacialGeology 
2/ Oldest sediment in the valley are these oxidized fluvial gravels. Ages in the lowest gravel are 29 ka. Alternating gravel and lacustrine represent blockage by glaciers at the mouth of Chehalis. Wood present at ~19,000 years old.
3/ Detail of tree at contact between gravel and glaciolacustrine dated to ~19,150 years old.
