Duane Braun will talk about what goes into creating more detailed geological maps of Mount Desert Island when he speaks at the Southwest Harbor Public Library on June 16. PHOTO COURTESY OF DUANE BRAUN

Geologist to present MDI map revision



SOUTHWEST HARBOR — Geologist Duane Braun will talk about the process of revising the geologic maps of Mount Desert Island at the Southwest Harbor Public Library on Tuesday, June 16, at 5:30 p.m.

The Surficial Geology (glacial deposit) map and the Bedrock Geology map of the island are being revised and updated at more than twice the detail of the current MDI geology maps. This updated, detailed work, especially for the glacial deposit map, is possible because of Lidar imagery, which became available in 2011. It shows the land surface without vegetation.

Between 2012 and 2014, bedrock and glacial deposit outcrops were located and described. This was accomplished by walking the entire Mount Desert Island area. Hiking trails were used some of the time, but most of the work was done by bushwhacking off trail. Field observation sites were located within a few feet by a GPS unit.

When walking is nearly impossible during winter, data gets entered into spreadsheets. The geologist then works with GIS personnel at the Maine Geologic Survey to create, digitize and edit the maps, a process which should be complete in 2015. At present, the glacial deposit map is essentially complete while the bedrock map is about one-half complete. Both maps should be available in the spring of 2016 in time for the centennial of Acadia National Park.

Braun earned his doctorate at Johns Hopkins University in 1976. He was geosciences professor at Bloomsburg University from 1975-2008. He taught environmental, physical and field geology, geomorphology and hydrogeology. While living in Pennsylvania, Braun mapped the glacial deposits of a 9,000-square-mile area for the Pennsylvania Geology Survey. He has taught the geology of MDI for Acadia Senior College.

Seating is limited; pre-registration is required. Call the library at 244-7065.

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