[meteorite-list] How The Earth Was Made:The Great Lakes--Shattercone?

[Mr EMan]

Nice series but they take a few minor liberties with accuracy to explain some things. Towards the last 20 minutes when the tall, white-haired older scientist starts talking about the depth of Lake Superior...Well right around the time he is going to take a submersible down to the floor some 13,000 ft below he shows a reddish rock the narrator says are striations due to glacial action but the glimpse I got sure looked like a shatter cone. So be on the look out and let me know your opinion.

Not telling the whole ending but research turned up a failed rift zone in Lake Superior that exposes a deep basalt chimney.  This may be the source for basalt meteor-wrongs coming out of Michigan which arises on the list every few years.

They did not allude to any impact related melting when the glacial lakes breached dumping several million cubic ft of water and so scoured out channels in a matter of hours.

Elton

PS: I've had extensive email server issues and am not receiving much of anything off-list or on  I did check the archives and  what I might have been inclined to say has already been said so just--God Speed