The Pine Tree State GeoArt series will take you on a short trip not far from Stratton. The road is passable by most cars, but bikes and e-bikes are fine too. There is also about a mile or so of walking. Each cache will highlight something interesting about Maine.
Mount Desert Island
MDI is on the edge of the Gander terrane, a New Zealand-sized slice of continental crust that split off of the southern continent of Gondwana about 550 million years ago (mya). Sediment deposited in the obliquely opening rift was metamorphosed as compression occurred locally to form the Ellsworth Schist, found on the north and west side of MDI (geologic map next page). Gander traveled north to collide with Laurentia, the name for the geologically old core of North America, to form what is now Maine at about 440 mya. Along the way sediments were deposited on the trailing edge of Gander, the Bar Harbor Formation on the east side of MDI (geologic map next page). Following behind Gander was the Avalon terrane. Avalon collided with Gander starting at about 420 mya. At that time a line of volcanos formed along the collision zone that today is the coast of downeast Maine.
Source: A Synopsis Of The Geologic Story Of Mount Desert Island (MDI) By Duane and Ruth Braun
If MDI was formed, in part, by volcanoes, the cache is at: N 45° 11.099' W 070° 22.309'
If MDI is flat, the cache is at: N 45° 11.056′ W 70° 22.356′