The Geology of Mount Desert Island
A Visitor's Guide to the Geology of Acadia National Park
The southern end of Schoodic Peninsula, also part of Acadia National Park, is made up almost entirely of a fine-grained granite that is similar to that of Southwest Harbor (Figure 11).
Beautiful exposures of diabase dikes that cut the granite are present on the southern end of the peninsula. An excellent place to study the details of these dikes is at the parking area at Schoodic Point. The shore ledges are particularly interesting because you can see evidence for more than one episode of dike intrusion; you will find younger dikes cutting across older dikes, as well as fragments of older dike rock enclosed by the younger dikes. You can also see how the cracks filled by the magma taper and eventually end (Figure 12). This is one of the best places in the park to see how dikes are formed by fracturing of solid rock followed by the intrusion of magma.
Last updated on January 11, 2008