Balance Rock along Shore Path in Bar Harbor. I don’t understand About Balance Rock: The large boulder is an excellent example of a glacial erratic and has been popular with the photographers for years. It has a different makeup than the surrounding rock, as can be seen by the color and texture of the stone compared to the ledge it sits on. It is not indigenous to this area and was left behind at the end of the last ice age more than 10,000 years ago. Geologist speculate that its origin is 40 miles northwest of here in the Lucerne area, just south of Bangor. The glacial ice was more than a mile thick and moved in a northwest to southeast direction. It played a major role in sculpting our bays, lakes, mountains and valleys, and scraped off the tops of the mountains leaving them rounded rather than pointed like the younger Rockies.