Fragrance Lake addendum: Where quartzite in the till comes from

Broken surface of quartzite.

Broken surface of quartzite.

I’ve been asked about the source for the quartzite clasts in Puget Lowland glacial till. They are diagnostic of a British Columbian provenance for the Puget Lobe of the Vashon advance, and the great glaciations that preceeded that one. Go to the quartzite page, where I discuss the source for these pebbles, and attempt to confuse everyone because there are two kinds of quartzite.

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2 Responses

  1. Dave, thanks for this post. I learned a couple of things, notably about the likely source of the quartzite in Vashon till, and also that it is orthoquartzite, not “true” metaquartzite. I hadn’t fully realized this, even though I have been teaching geology in these parts almost since these stones were carried here by ice!

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