[Alberta's Child]

I read a fascinating article about a similar "climate catastrophe" in the Hudson River valley in what is now New York State at the end of the last ice age, in which a natural berm or ice dam burst and sent a torrent of water, ice, rock, etc. down to the Atlantic Ocean.

The evidence for this type of event was found out along the continental shelf off the coast of New Jersey, in the form of large rocks scattered on the ocean floor that are indigenous to the Adirondack Mountains -- hundreds of miles away from the mouth of the Hudson River.

[Vaquero]

and of course the Hudson canyon remains today under the ocean wending along.......a trench that goes hundreds of miles out into the Atlantic before it ends at the dropoff of the continental shelf.

[djf]

There's alot of interesting geology in New York. There is a place near where I grew up where the shale bedrock is exposed, and you can see the grooves cut in the rock from the glaciers.

Alot of New York was at one time, submerged. Some of the largest salt deposits in the world are buried in the western part of the state.

[Publius6961]

You may be describing the same event as the article...