I'm downloading DOQQ and DEM data from the USGS seamless server (I was going to make some 3D images of Mt. Hood for a friend anyway). I'll try to post links to my images, including a simple profile analysis and vertically exaggerated 3D images. I hope that the data is available in 1/3-arc second resolution. At 3-arc second resolution, the structure does have a prominent sidewall, but is still, according to a lithological GIS layer I have currently loaded, within the boundaries of "mafic volcanic flow," e.g. basalts, and not material associated with pyroclastic, siliceous lavas (dacite, andesite) that form the Cascade stratovolcanoes. Mt. Mazama, the name given to the former stratovolcano that currently we call crater lake, was radically altered by its last major eruption, 7,627 BP (http://geology.geoscienceworld.org/cgi/content/abstract/27/7/621). Its tephra layer is an important chronological constraint in geochronology and in archaeology, and is present in various thicknesses (following monotonic decrement, but distributed much more extensively NNE) from Northern California to Saskatchewan to Montana. ... off to work. Thaddeus --- Jerry <[EMAIL PROTECTED]> wrote:
> Cool news ie. impact causing HOT SPOT. Sooooo Cool. > If we generalize [which > I presume we must not without scientific data to > support the supposition] > Yellowstone, Sunset Crater, etc. are all impact > sites caused when the crust > was so deeply wounded the mantle material persists > in melting whatever > crustal material attempts to scab the wound! > SUPER COOL!! > Jerry Flaherty > ----- Original Message ----- > From: <[EMAIL PROTECTED]> > To: "Stefan Brandes" <[EMAIL PROTECTED]> > Cc: <meteorite-list@meteoritecentral.com> > Sent: Friday, October 12, 2007 5:01 PM > Subject: Re: [meteorite-list] Mysterious Circular > Structure Near Chemult, > Oregon > > > > Looks like something fun to check out either way. > I've been meaning to > > get over and explore that general area. Of course > it would have to be > > pretty obvious for me to notice anything :-) > > > > By the way, I have heard a theory that there was a > large strike at some > > point in central Oregon causing a "hot spot" in > the mantle (?) which has > > since migrated through the Snake River plain in > southern Idaho and now > > lies beneath Yellowstone National Park resulting > in all of the geothermal > > activity in that area. > > > > Thanks for sharing! > > > > Phil > > > > > >> Interesting formation : > >> > >> > http://epod.usra.edu/archive/epodviewer.php3?oid=382976 > >> > >> any ideas? > >> > >> Stefan > >> ______________________________________________ > >> Meteorite-list mailing list > >> Meteorite-list@meteoritecentral.com > >> > http://six.pairlist.net/mailman/listinfo/meteorite-list > >> > > > > > > ______________________________________________ > > Meteorite-list mailing list > > Meteorite-list@meteoritecentral.com > > > http://six.pairlist.net/mailman/listinfo/meteorite-list > > > ______________________________________________ > Meteorite-list mailing list > Meteorite-list@meteoritecentral.com > http://six.pairlist.net/mailman/listinfo/meteorite-list > ____________________________________________________________________________________ Shape Yahoo! in your own image. Join our Network Research Panel today! http://surveylink.yahoo.com/gmrs/yahoo_panel_invite.asp?a=7 ______________________________________________ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
