As cold and harsh as Maine winters can be, 25,000 years ago, the land we know today as Maine was pinned underneath roughly a mile of snow and ice.
The Laurentide Ice Sheet, covering most of present day Canada and the northern United States, slowly shaped the land beneath. Intense weight and erosion ground mountains to the now familiar rounded granite hills, and carried rubble for miles southward.
The retreating glacier left its heavy baggage in unexpected places after melting.
Bubble Rock, a glacial “erratic,” was one such massive, multi-ton geological traveler, and was left perched on South Bubble Mountain, visible today in Acadia National Park.
While melting, the glacier exposed a raw landscape to the Atlantic Ocean, which flooded north as far as Millinocket, and left layers of blue marine clay behind. After millennia of crushing weight, the land began to rise, pushing the coastline south to its present-day location, and creating Maine’s long and rocky coastline enjoyed today.