In accordance with GSA policy, personal vehicles are not allowed. Leaders of trips 1 and 3 intend for their trips to run regardless of weather; trips will be cancelled only in the event of a major or severe storm on the day of the trip. The ferry chartered for the half-day trip is the one normally used for ferry service to the Casco Bay islands during the winter months; hence, this trip is expected to be run even if weather conditions are less than ideal.
- Coastal Storms, Sediment Budgets, and Mitigating Engineering in Saco Bay.
Leaves at 9 a.m. on Sat., 21 March, from Holiday Inn By the Bay, Spring Street entrance; returns by 4 p.m. Cost: professionals, US$35; students, US$20; includes transportation, lunch, and field guide. Max.: 40; min.: 10.
Stephen M. Dickson, Maine Geological Survey - Augusta, +1-207-287-7174; Peter A. Slovinsky, Maine Geological Survey; Joseph T. Kelley, Daniel Belknap, Laura Brothers, University of Maine.
Coastal engineering in Saco Bay (just south of Portland, Maine) over the past 140 years has led to significant changes in shoreline positions and sediment budgets that include loss of property and increased flood hazards. Natural dunes have been destroyed by erosion, and new dunes have been created by accretion in separate parts of the bay. Restoration of an equilibrium shoreline and reduction of land loss will be presented in the context of U.S. Army Corps of Engineers mitigation plans for additional coastal engineering in the form of segmented breakwaters and beach nourishment. Short-term shoreline protection in the form of a geotube-cored dune is a possible municipal response to prevent more erosion and flooding as impacts of various long-term mitigation alternatives are explored. Trip participants should be prepared to climb over rocks and walk streets and the beach in inclement spring weather.
- The Sebago Pluton and the Sebago Migmatite Domain, Southern Maine: Results from New Studies.
Leaves at 8:30 a.m. on Sat., 21 March, from the Holiday Inn By the Bay, Spring Street entrance; returns by 5:30 p.m. Cost: professionals, US$35; students, US$20; includes transportation, lunch, and field guide. Max.: 30; min.: 10.
Gary Solar, SUNY College at Buffalo; Paul Tomascak, SUNY-Oswego.
Participants on this one-day trip to look at outcrops north of Portland will visit rocks typical of the Sebago pluton and the surrounding rocks of the Sebago migmatite domain. We will examine evidence used to define the Sebago pluton (sensu stricto; ca. 293 Ma) separate from the migmatite domain and as a body smaller in area than shown on published maps. The trip will address new field, geochemical, and geochronological data that have helped us to determine this spatial relation but also have led us to understand the timing relations between the pluton and the migmatites. For the purposes of this trip, outcrops are located along or close to roads, so no strenuous hiking is planned. In the event that this trip is curtailed or cancelled due to high snow pack and outcrop inaccessibility, those who have PREREGISTERED will have the option for a refund or to go on Trip 3 as an alternative for no additional fee.
- Geology Cruise around Inner Casco Bay.
Sat., 21 March: Meet at 12:30 p.m. for boarding at Casco Bay Lines ferry terminal, 56 Commercial Street, Portland, a 20-minute walk from the Holiday Inn By the Bay. Departure: 1 p.m.; return: 4 p.m. Cost: professionals, US$45; students, US$30. Max.: 200; min.: 40.
Arthur M. Hussey II, Bowdoin College (emeritus), +1-207-666-5526.
Beautiful scenery and fascinating geology await you, all within sight of the conference hotel. Join us for a guided tour of the rocky mainland shore and islands in Casco Bay. Lighthouses and stone forts, lobster boats and vacation communities are perched on folded and faulted metamorphic rocks of an Ordovician backarc basin sequence. You will see several type localities of stratigraphic units in the Casco Bay Group and studied outcrops of importance to regional interpretations, all from the comfort of a modern all-weather ferry. A preliminary version of this trip was run in 1988. Now that Prof. Hussey has retired, the geologic maps and interpretation are much improved. Recently published bedrock maps of the Portland East, Portland West, and Prouts Neck quadrangles are recommended (contact Maine Geological Survey). Participants are encouraged to bring binoculars, cameras, and appropriate clothing for forays to the open upper deck. Fee includes a free drink ticket at the on-board cash bar. After the cruise, enjoy dinner along the waterfront or in the Old Port district on your way back to the meeting's welcoming reception.