Originally Posted by
Markeologist
Clearly the sentence is referencing the period when the glaciers are receding (it states "melting") as the planet warmed and thus the southern edge of the ice sheet was moving northwards (i.e., receding as opposed to advancing)....kind of basic earth science to all but the troll who denies glaciation occurred.
Clearly, it also states "calving", which is quite the opposite of melting. All in all, it is a ****ed-up sentence.