A wayside exhibit located in the pull out on Park Loop Road next to South Bubble Mountain features an informational panel angled atop a large rock. Trees frame a view of a mountaintop, where a large round boulder rests on a ledge.
The exhibit's title, "Well-Traveled Boulder," appears in a cloudy sky over a massive boulder with a rough gray surface perched precariously on a rocky slope.
Introductory text invites visitors to look up at the boulder, called Bubble Rock, on the south face of South Bubble Mountain. "This glacial erratic has been sitting there since the last glacier retreated from this area about 15,000 years ago." The Lucerne granite boulder "came from hills 30 to 40 miles away to the northwest."
More text notes that the rock weighs 28,000 pounds, "as heavy as two large African elephants."
The boulder is made of Lucerne granite, different from the granite in the mountain.
Two circular images compare Bubble Mountain's Cadillac granite, with its small purple crystals, to the erratic's Lucerne granite, which is gray with larger crystals. This comparison shows that the erratic was carried here from far away by retreating glaciers.
Text continues: Millions of other glacial erratics "are found everywhere from Acadia's mountaintops to forest floors to cobble beaches."
An inset photograph features a pair of brown erratics with smooth angled edges jutting out of an icy mountainside. "These two erratics were deposited by Alaska's Root Glacier in Wrangell-St. Elias National Park."
