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The earliest history recorded in the rocks of the park dates back perhaps 550 million years, to the Cambrian Period. At this time the region was part of an ocean floor. Mud, some of which formed from explosive volcanic ash falls, accumulated on the sea floor. Continued deposition of sediments buried the mud well below the earth's surface where it was squeezed and heated by forces acting within the earth. Eventually, uplift and erosion exposed this material at the earth's surface once again, not as mud but as the metamorphic rock we now call the Ellsworth Schist.

The youngest rocks found on Mount Desert Island are the intrusive igneous rocks. The gabbro-diorite, diabase dikes, and the various granite bodies were emplaced between 360 and 380 million years ago during the Devonian period.

Geology

Metamorphic, sedimentary, and igneous rocks can all be found on MDI.