Wood from the Shoreline

Fungus in “Interglacial wood” (2-3,000 year old wood covered by the most recent advance of Mendenhall Glacier) on he shore of Mendenhall Lake also is being replaced by silica. Below is a
photo of this wood taken in bright sunlight with the brightness decreased to reveal the colorful silica, the brightest parts of the image.

Similar sand and gravel deposits are found in Tasmania, Maine, and Oregon. The process is ongoing and widespread. Judging from the amount of sand out there this appears to be evidence of a huge biogeochemical system that has yet to be accounted for.