QUOTE : Although the hill is not high enough to enable one to see Nantucket in its entirety, Altar Rock is the best seat in the house when it comes to imagining how the island originally came into being. Between 22,000 and 16,000 years ago, a giant glacier stretching across what is now Nantucket Sound bulldozed Saul’s Hills into a rough approximation of their present form. This is where the icy shovel of the bulldozer stopped, dumping the boulder we see beside us.