Sterling,
There is a bit (with references) about the astrobleme theory for the
Nastapoka Arc here... https://en.wikipedia.org/wiki/Nastapoka_arc
Consensus seems to be no evidence. Possible tectonic origin.
John Hendry
On 29/06/2015 10:07, "Sterling K. Webb via Meteorite-list"
wrote:
>Paul, Ed, List,
>
>The village is actually named "Kitscoty."
>https://en.wikipedia.org/wiki/Kitscoty
>
>Kitscoty is named after a village in
>Kent (U.K.) with a famous stone
>megalithic structure, so while Googling
>for a Kitscoty Structure you have to
>distinguish which Kitscoty and what
>kind of structure is meant.
>http://albertacommunityprofiles.com/Profile/Kitscoty/2
>
>The "structure" referred to is a proposed
>"rebound" plateau of an impact south of
>Kitscoty, Alberta, Canada:
>http://www.meridianbooster.com/2009/03/18/did-a-massive-meteor-touch-down-
>he
>re
>
>I don't know (and am not going to Google
>myself to death finding out), but I recall
>that Hudson Bay and the Canadian
>Shield is very old crust, at least 2.0 to
>2.5 billion years old.
>
>It is bound to have evidence of a great
>many impacts in that long time span,
>but most, of ancient age. Plus, the
>Canadian Shield has been scoured by
>every ice age for billions of years, over
>and over and over again. Only evidences
>that can survive that will be found.
>
>With typical human short-sightedness,
>most theories of any explanation of a
>feature in Northern Canada are always
>referred to "the last Ice Age," which is
>only the last few million years, while
>the Shield is immensely more ancient
>and has been exposed for BILLIONS of
>years.
>
>Northern Canada contains a great
>many craters; see:
>http://www.thelivingmoon.com/43ancients/02files/Earth_Images_09.html#Steen
>
>I can suggest another very ancient crater:
>the south-southeastern coast of Hudson
>Bay, above James Bay is a portion of
>a perfect circle and it has a nice cluster
>of islands at the geometric center of
>that circle like the remnants of central
>peaks. I've always thought that it could
>be what's left of a very, very ancient
> "astrobleme." See map at:
>http://www.worldatlas.com/aatlas/infopage/hudsonbay.htm
>
>It's very suggestive. But evidence? I
>know of none.
>
>Sterling Webb
>--
>
>-Original Message-
>From: Meteorite-list [mailto:meteorite-list-boun...@meteoritecentral.com]
>On
>Behalf Of E.P. Grondine via Meteorite-list
>Sent: Sunday, June 28, 2015 10:53 AM
>To: meteorite-list@meteoritecentral.com
>Subject: [meteorite-list] Changes In 14C and Impacts
>
>Hi Paul -
>
>Thanks for the link to that paper.
>
>I am looking forward to your comments on the Kiscoty structure.
>
>My guess is that the depth of the ice sheet may be estimated from the
>height
>of the rebound, but I am incapable of performing detailed calculations
>from
>any formula you may know of.
>
>My working assumption is that nearly all of the energy released from the
>initial blast went into different processes which melted the ice sheet -
>such as the infra-red, the boiling water returning to Earth, the hot
>impact
>dust returning, etc.
>
>E.P. Grondine
>Man and Impact in the Americas
>
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