Duane and Ruth Braun will speak about the geological history of Mount Desert Island at the Southwest Harbor Library on June 28. PHOTO COURTESY OF DUANE BRAUN

Brauns to share history of island geology

SOUTHWEST HARBOR — Geologists Duane and Ruth Braun will talk about the geological makeup of Mount Desert Island when they visit the Southwest Harbor Public Library on Tuesday, June 28, at 5:30 p.m.

At the end of the talk, there will be a book signing for their just-published book, “Guidebook to the Geology of Mount Desert Island and Acadia National Park.” Proceeds will benefit the library.

The Brauns will take the audience on a geologic history tour beginning around a billion years ago when MDI was attached to the super continent, Gondwana. It split from Gondwana and eventually attached itself to North America. The island itself experienced three major geologic events, which resulted in the formation of 10 different rock units that now make up MDI.

Ruth Braun earned her master’s degree from Johns Hopkins University. She has taught science, math and geology courses in a variety of high schools and universities.

Duane Braun earned his doctorate from Johns Hopkins University. He was the geosciences professor at Bloomsbury University. He also mapped the glacial deposits of a 9,000-square-mile area of northeastern Pennsylvania for the Pennsylvania Geology Survey.

Both Duane and Ruth Braun have been instructors for Acadia Senior College, teaching about the geology of MDI, and have written a new guidebook to the geology of the island. Duane Braun has revised the geologic maps of the island for the Maine Geologic Survey. The Surficial Geology (glacial deposit) map of Mount Desert Island is presently available as a free PDF download. The Bedrock Geology map should be available later in the year.

Call the library at 244-7065. Reservations are required. If the talk is oversubscribed, a second talk and book signing will be scheduled for later in the summer.

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