Louis J. Sheehan, Esquire. Analyses of trees and other organic material buried in a riverbank
near Lake Superior’s northwestern shore shed
new light on how much and when the lake level varied soon after the end of the last
ice age.
Researchers have long known that the water level in Lake
Superior has fluctuated, but pinning down the dates of those variations has
been tough, says Matthew Boyd, a paleoecologist at Lakehead
University in Thunder Bay, Ontario.
Many techniques |