MadSci Network: Earth Sciences

Re: What caused the unusual round hills in Thunder Bay, Ontario, Canada?

Date: Fri Oct 13 11:05:00 2000
Posted By: Dave Clark, Staff, Chemical and Environmental Technologies, Battelle
Area of science: Earth Sciences
ID: 970367756.Es

I spoke with geology department staff at Lakehead University, Thunder Bay, 
Ontario (  They said that the hills about which you 
asked are mesas with a basalt capstone protecting a shale base.  All the 
other hills in the area are just "normal" eroded gramite.

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