[Rockhounds] Another extinction impact-13 KYA-No Red Herring

[Mr EMan]

Red Herring?   I have to disagree.  As one who is a part time researcher-- sampling glacial outwash planes in the northeastern US for glass microsphere deposits. I've kept abreast of this topic before it became a topic.  There is evidence mounting weekly that a major cometary impact occurred over north eastern North America approx. 12,900-13,100ybp. Strata of "black sand mats" containing glass microspheres, charcoal, nano-diamonds, and
Buckyballs are bening located all over eastern North America: From
caves in near both Cinncinatti and Sandusky Ohio over to the enigmatic  "Carolina
Bays" features up and down the east coast.  Meteoric iron embedded in Mammoth Tusks and Bison horns from other times suggest large impacts occured several times earlier in the present ice age.

 Ice dam breaching  ( if that is what it was) apparently  occurred at several places along the icesheet front simultaneously. While it is true that massive meltwater runoff is likely to have changed ocean currents, an impact can account for causing that sudden melting. The present lack of identified impact crater is understandable given the true depth of the existing ice sheet(2miles?) is not known but, could have absorbed most or all of the impact whithout leaving easily located deposits of insitu impactites.  There is no primary strata left to analize--as of yet but many are working on it finding evidence in situ not just in outwash deposits. If we look at the rock called Ice and think of melting as erosion, it puts erosion on a accelerated timescale never seen before. Which has good and bad points for reconstructing the events.  

Hardly a red herring but a mounting body of evidence which ties together the younger dryas anomomally, regional extinction of large ice age animals populations which never returned and, dissapearance of the Human Clovis culture in mid and northern North America for approximately 800 years.

Eman

--- On Fri, 1/2/09, Dora Smith <tiggernut24 at yahoo.com> wrote:
Thanks.  The article is a red herring.   It has been satisfactorily demonstrated that the abrupt cooling was the result of the massive outpouring of melted ice into the northern Atlantic when an ice bridge that had held it back melted.  


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