2011 GSA Annual Meeting in Minneapolis (9–12 October 2011)
425 Tuesday, 11 October 2011
1:00 PM-5:00 PM, Minneapolis Convention Center: Ballroom A Foyer, 2nd Ave. Entrance

The Minneapolis Chain of Lakes by Bicycle: Glacial History, Human Modifications, and Paleolimnology of an Urban Natural Environment

Primary Leader: Marylee Murphy
Leader(s): Amy Myrbo, Valerie L. Stanley
Field Trip Description: The land around the urban lakes of Minneapolis was designated as city park space in the early 20th century, when canals were dredged to join the lakes for boating and pedestrian paths were built around them. The Minneapolis Chain, comprised of Brownie Lake, Cedar Lake, Lake of the Isles, Lake Calhoun, and Lake Harriet, is part of a larger pattern of lake chains across the Twin Cities metro area formed by ice blocks in subglacial tunnel valleys or paleochannels.  Many of these lakes are deep for their size, and are persistently stratified (and thus depositing laminated sediments) either naturally or under cultural eutrophication and road salt inputs; Brownie Lake has been meromictic since about 1915, and has extremely high dissolved Fe and Mn levels, along with magnetotactic bacteria populations, in its bottom waters. Join us for a leisurely ~15 mile flat ride along the wooded lakeshores with stops to discuss their late-Glacial formation; the history of human manipulation of their shapes, depths, and geochemistry; and their recent sedimentary records.  Laminated sediment cores and associated data will be presented, and trip leaders will discuss the potential for using urban and other lakes in place-based, hands-on, interdisciplinary coursework for all ages of students.  Bikes will be provided; helmets will be provided upon request.  Rain or shine.
Field Trip will span: 1 day
Sponsor(s): Limnogeology Division

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