AS I understod it, Doug they did an isotope /element count(?) of a breccia known as the Buttermere Formation believing it to be composed of bombarded Earth Rock. I didn't catch that the age was Ordovician but I might have missed that. I do not know the time span nor if their are any other contemporaneous exposures that show a similar collection of apparently extraterrestrial material. I only scanned the article quickly but did look up the formation--it is near the Wales England border. Be it remembered that all of the UK isles are a hodgepodge of sutured pieces of rocks terranes covering recent to very ancient. Buttermere's original plate is long gone.
I've done a lot of work in Ordovician rocks and haven't seen any sign. I have run into 4 sites in Carboniferous material that I am fairly sure were fossil meteorites. Once, I found a series of nodule cavities on a ripple marked sandstone boulder which I took photos of but, when I returned with a diamond saw to retrieve them the boulder had been moved to the crusher. Regards, Elton ________________________________ From: MexicoDoug via Meteorite-list <[email protected]> To: [email protected] Sent: Tuesday, January 24, 2017 2:24 PM Subject: Re: [meteorite-list] (no subject) "Rare meteorites common in the Ordovician period" Ordovician meteorite hunters must have been brachiopods (Team Brachinite). Do the authors understand or speculate how different the absolute "flux" was for achondrites, for anyone reading this? In other words, are the ordinary chondrites just less common 467 mya making this a better title: "Common meteorites rare in the Ordovician period" " Big difference ... Otherwise the hypothesis is sensible ... that through the ages the relative frequency of meteorite types goes up and down depending on the latest collisions and shipping lanes ... Cheers Doug -----Original Message----- From: Tommy via Meteorite-list <[email protected]> To: meteorite-list <[email protected]> Sent: Tue, Jan 24, 2017 1:04 pm Subject: [meteorite-list] Rare meteorites common in the Ordovician period http://www.nature.com/articles/s41550-016-0035 Regards! Tom ______________________________________________ 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
