| Rocks in Boyne Valley and
throughout Charlevoix County are of
two major types. The surface
of Boyne Valley is completely
covered with glacial till and
glacial outwash deposits that
contain many loose rocks distributed
throughout the soils in the
form of gravel, cobbles, and
boulders. They represent
material that has been torn out of
bedrock deposits north of Charlevoix
County by the southward moving ice
of glaciers. There position in
the till is random. A
limestone rock from Emmet County may
be found side by side with a granite
boulder from hundreds of miles
further north
in Canada. The other type
of rock that underlies Charlevoix
County is bedrock. There are
no known surface outcrops of bedrock
in Boyne Valley but, if the glacial
deposits were removed, several
sedimentary rock formations of
limestone and shale would be
exposed. The following
illustrations tell some of the
story. |
.jpg)
%20.jpg)