>>isn't it typically a coastal feature created by the flooding of an ice-formed 'river' valley?


Yeah, but crossing thread, i did mention NY is at the southern boundry for the last Glacier-- (glacier=Ice)--(the bit about the terminal moraine..) an yes, it was the last glacier, in the last ice age that scoured out the river bed..

the glaciers went further south inland.. but here on the east coast, NY markes the southermost extention of the ice covering, and as result, is home to the southern most fjord in North America. (i think there are even more southerly ones on the east coast of asia, either on island or mainland, but hey, that's not were i hang my hat, so i don't know the details!)