I don’t know if it was in “Earth in Upheaval” or one of his other books, but Velikovsky also reported numerous finds of great heaps of shredded and broken large animal bones in Canada, and flash frozen Mammoths with undigested buttercups in their stomachs in Siberia, of the right age.
Regarding bay formations, could great chunks of ice have been blown all over the place causing gouges, and/or sitting and melting and forming pools which which would subsequently be modified by wind and frost?
For more than 30 years I have thought that the Younger Dryas could have been caused by a boloid impact. I thought it might have been in the North Atlantic after I read something about tectites found in our southern states oriented to the northeast of the right age. Unfortunately I have been unable to refind this information.
I would guess no because of the heat.
A great impact structure was recently discovered in the vicinity of the lower Chesapeake Bay (Poag, et al., 1992). Another large crater is possibly suggested by seismic reflection data approximately 60 miles offshore from Atlantic City. These craters are the probable source of tectites (impact ejecta) found in sediments of Late Eocene age (~35 million years ago) and younger sediments throughout the Coastal Plain region.
this website may be of interest.