Victoria ahead..., Time spent at Emma Dean |
Victoria ahead..., Time spent at Emma Dean |
Sep 5 2006, 07:13 AM
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The Poet Dude Group: Moderator Posts: 5551 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 |
Might I humbly suggest this new thread, as Victoria looms large before us..?
GREAT images guys. I was out last night and have only just got online, to find Victoria opening up ahead of us... what a fantastic time! -------------------- |
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Sep 8 2006, 06:59 AM
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Senior Member Group: Members Posts: 3008 Joined: 30-October 04 Member No.: 105 |
That's what I've been thinking, too, Aldebaran. The fresh ejecta material was a pulverized mixture of the evaporite unit plus the (supposed) underlying basaltic unit, plus the melted rock present as the (apparent) "tektites" in the surface material. With time, the erodable evaporite fraction was removed leaving the hematite blueberries and the basaltic on the surface. Remember that we see two size categories of spherules and sand on the surface which form a desert pavement overlying a lighter-toned, evaporite-rich horizon, which represents the less-eroded ejecta mixture. I was surprised to see this many blueberries on the ejecta apron but it makes sense that we see them here as this process would naturally tend to concentrate the blueberries.
By way of one terrestrial example, when the bedrock in a humid climate is a cherty dolostone the residual surface material is a cherty clay soil with the dolostone a very few meters down. Unless you excavate a roadcut or look in a stream channel you don't see the bedrock. --Bill -------------------- |
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