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" <[email protected]> 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:[email protected]] >On >Behalf Of E.P. Grondine via Meteorite-list >Sent: Sunday, June 28, 2015 10:53 AM >To: [email protected] >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 > >______________________________________________ > >Visit our Facebook page https://www.facebook.com/meteoritecentral and the >Archives at http://www.meteorite-list-archives.com >Meteorite-list mailing list >[email protected] >https://pairlist3.pair.net/mailman/listinfo/meteorite-list > >______________________________________________ > >Visit our Facebook page https://www.facebook.com/meteoritecentral and the >Archives at http://www.meteorite-list-archives.com >Meteorite-list mailing list >[email protected] >https://pairlist3.pair.net/mailman/listinfo/meteorite-list > ______________________________________________ Visit our Facebook page https://www.facebook.com/meteoritecentral and the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list [email protected] https://pairlist3.pair.net/mailman/listinfo/meteorite-list
