Re: [Geology2] Post Glacial Rebound in The Great Lakes Area

On 06/14/2012 09:53 PM, Woody wrote:
> The Great Lakes area experienced a cataclysmic break in the Earth's crust causing a bowl shaped depression on the surface of the Earth. Subsequent glaciers bulldozed debris into the bowl, filling it level with surrounding land. But oil produced over subsequent ages within the bowl drained to the lowest point of the depression. After removal of the oil mid-1900s the hole is now used to store natural gas for the cities of the lower Great Lakes. The article is on a virus free writers's site. Enjoy the read.
>
>
> http://floriswood.hubpages.com/hub/Post-Glacial-Rebound-in-the-Great-Lakes-Area

I missed something. I can see how the weight of ice causes
a depression, and the movement of ice fills the depression
with rocks and gravel. And when the ice melts, the
depression rises a bit and lifts the center of that filling.
But how does any of this process make an underground
chamber that oil could run into (or leave a void after that
oil was removed)? That part of the story didn't make sense
to me.

--
Regards,

John Popelish


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