[Tweeters] Glaciers Don't Retreat
yekramw at gmail.com
Thu Aug 2 23:14:37 PDT 2018
To follow up on Jeff Gibson’s email:
I’ve found a great geology professor at CWU, Nick Zentner, that has MANY You-tube offerings on the geology of the Pacific NW. For instance, did you realize Mt. Stewart moved up here from Mexico? (A plate that no longer exists). See his You-Tube lecture.
What about the FACT that the Columbia River was COMPLETELY blocked about 650 years ago! - See his You-Tube on “The Bridge of the Gods”.
There are many videos of his on WA geology. Puget Sound, ancient volcanos, ice age floods, etc. He is a great lecturer too. He rivals Dr. Paulson, who I had the pleasure of taking a class from summer quarter 1971!
Sorry Dr Paulson! He is really good, as you were/are!
We moved to Ellensburg from Auburn (On Soos Creek) moving just over two years ago. Dr. Zentner lectures to the local community (for free!) about 8 times a year, 4 lectures in winter and 4 in the summer. Most of the You-Tube videos are those lectures. (If you knew us, you would see our heads in the center of the audience near the front in the last year of lectures).
Check him out. I promise, you won’t be disappointed!
> Will Markey
> General Adjuster
> Cell - 253-569-8455
> Sent from my IPhone
>>> From: Jeff Gibson <gibsondesign15 at gmail.com>
>>> Date: August 2, 2018 at 21:57:23 PDT
>>> To: tweeters at u.washington.edu
>>> Subject: [Tweeters] Glaciers Don't Retreat
>>> Oh sure you've heard all about the semi-tragic retreat of glaciers worldwide. Oh well, it's happened before. Here today, gone in some hundreds or thousands of years later.
>>> However, glaciers don't really retreat. It's not like they crawl back up the mountain, or go back to Canada for another load of rocks. No, glaciers just melt, dropping their load of rocks and stuff right where the glacier melts out from under them.
>>> I got to see this in action while working at Mt.Rainier for a few summers. I lived in employee housing overlooking the Nisqually glacier, occasionally hearing a big roar of rockfall off the far side where the glacier was undercutting the ridge, the rock and dirt fanning out over the surface of the glacier, where, covered by the next winters snowfall it was incorporated into the ice. If the glacier advanced, the rocks got carried downhill maybe, but the rocks were just applied where they melted out - possibly in a moraine, which is a ridge formed by rocks melting out of the glaciers edge and bulldozed off to the side by the still moving section of ice or left at the glacier's terminus.
>>> The fascinating and beautiful beach cobbles of Port Townsend are largely from elsewhere,the granites and gneiss, quartzites and serpentine are not native to the Olympic Peninsula. I like serpentine because of its beautiful patterns and the fact that it's hard enough to take a high polish, yet soft enough to work with diamond files and polish with wet sandpaper. (got to examine carefully though because some of it contains asbestos), Sometimes sitting at this computer watching something that only takes a half-wit of attention (national news for example) I wet sand little serpentine pebbles or cobbles that I'll give away to friends as good luck stones. Found a real purdy one this morning, probably eroded out of the massive cliffs of glacial till around here.
>>> It is shorebird time again and watching the muddy edges at Kah Tai lagoon yesterday saw 3 Greater Yellowlegs, 3 Short-billed Dowitchers, several Killdeers, a whole lot of Barn Swallows and a single Virginia Rail lurking in the tules.
>>> Jeff Gibson
>>> Port Townsend Wa
>>> Tweeters mailing list
>>> Tweeters at u.washington.edu
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