GeoMapNW Forums
November 27, 2009, 05:05:16 PM *
Welcome, Guest. Please login or register.

Login with username, password and session length
News: Be sure to invite all of your friends! If you have an idea for a different discussion topic not listed below, let us know.
 
   Home   Help Search Calendar Login Register  
Pages: [1]   Go Down
  Print  
Author Topic: geologic history of the Bailey Peninsula (Seward Park)?  (Read 247 times)
0 Members and 1 Guest are viewing this topic.
Paul Shannon
Apprentice Rock Collector
*

Karma: +0/-0
Offline Offline

Posts: 1


View Profile
« on: April 27, 2009, 10:39:51 AM »

The Bailey Peninsula is an anomaly: a north-facing peninsula in a ribbon lake (Lake Washington), in which the lake was cut by southward flowing subglacial river flow.

I am untrained in the field (as you will quickly detect...) but I nonetheless find myself wondering, and speculating.  I am posting here in hopes that my speculations can be brought down to earth, corrected by those who really know some local geology.

Derek Booth's 1994 paper, 'Glaciofluvial Infilling and Scour...' suggests that the peninsula had to withstand 'locally intense linear scour'.  Is it plausible that the more resistant elements of the Blakeley Formation  -- which can today be seen in the peninsula, especially on the north facing cliff on the west side of Andrews Bay -- provided this resistance?

Even more speculatively, I wonder whether, during the period of highest subglacial river flow, the Bailey Peninsula was actually an island, with some flow to the east across what is now the isthmus, as well as through the stronger, deeper channel to the west, on the Mercer Island side.

I will be grateful for any comments, even the most deflating!

Cheers,

 - Paul Shannon
   Institute for Systems Biology
   Seattle
Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.9 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!
Page created in 0.262 seconds with 19 queries.