Ice accumulation on land lowered sea level by about 400 feet (120 meters). (landscapesandcycles.net)
This break was probably was formed by erosion during the last low sea level stand (while sea level was much lower and the reef was exposed as dry land). (ambergrisCaye.com)
The decline is so significant that it is sufficient enough to lower sea levels close to the ice. (techtimes.com)