Reconstructing the Late Glacial Environmental History of Brown's Lake Bog
by Clint Bailey
My Senior Independent Study, beginning in the fall of 2002, is an attempt to reconstruct the environmental history of Brown's Lake Bog, an area 20 miles south of Wooster, Ohio. Research for this project began in the summer of 2002 as part of the Keck Ohio research experience for undergraduate Geology students.
Figure 1. Working at Brown's Lake Bog
Figures 2 and 3. Driving the coring apparatus into the ground and extracting the sediment
Figure 4. One meter of sediment ready for analysis
|Peat is a fiberous organic substance
made of vegetation in various states of decomposition.
Interval: 3 to 9.2m
|Gyttja is a dark organic material
similar to peat, but less fiberous and more compact.
Interval: 9.2 to 9.8m
|Silt is a medium brown to grey
fine grain sediment, silt is refered to as mottled when
it shows certain textures of discoloration.
Interval: 9.8 to 12.3m
|Diamicton is composed of silt,
sand, and larger pebbles. Diamicton in a glacial environment
is refered to as till.
Interval: 12.3 to 12.35m
The sediments from Brown's Lake Bog represent environmental change since the last glacial period in Ohio. The variety in the materials shown above indicate that Brown's Lake Bog has been a vaslty different depositional environment over this time. Several studies such as Shane and Anderson (1993) have isolated as many as four significant periods of climate and biological change in northeast Ohio and throughout the Midwest. The challenge of this study is to compare the information yielded from sediments at Brown's Lake Bog to these other studies.
Shane, L.C.K. and Anderson, K.H. (1993). Intensity, gradients and reversals in late glacial environmental change in east-central North America. Quaternary Science Reviews, 12, 307-320.
Yu, Z. and Wright Jr., H.E. (2001). Response of interior North America to abrupt climate oscillations in the North Atlantic region during the last deglaciation. Earth-Science Reviews, 52, 333-369.
An article about Keck Ohio from the University of Cincinnati.
Pictures from the Keck Ohio group and our trip to the Canadian Rockies.