I'll explain to you about sea levels so you can understand. Tectonic plates rise and fall all the time. The earth's crust is constantly moving up and down. There are areas in our Country that were once under water and are now 100's of feet above sea level. IT WASN'T from receding ice. There are many factors that play into sea levels, not just melting Ice. The mass of all the ice on the planet, you would ONLY raise sea levels about 225ft. And, yes there were sheets in Cape May County, We found proof in fossils here.