The geology of Terre Haute was most influenced by
the last period of glaciation approximately 10,000 years ago. Receeding
glaciers left jutting granite outcroppings and rock-strewn slopes
that can still be seen today throughout the property. These glaciers
also formed gravel beds which became the streams and aquifers of
the region, further shaping the landscape.
Terre Haute (Bogus Mountain) forms a North-South ridge
- one of the southernmost of these ridges that eventually form the
"Litchfield Hills" and, further north, the Berkshire mountains
of Massachusetts. Inactive "locked up" seismic fault lines
parallel the ridge.
Bethel once touch Africa?
Some geologists have hypothesized that the hilly region of Northern
Fairfield County may have originated when plates of the earth's
crust separated, dividing the "supercontinent" of Pangaea
into the familiar modern continents. It is believed that this region
once connected the modern East Coast of North America to the Northwestern
corner of North Africa (see map at right). This hypothesis is supported
by known geological similarities between the two areas, and an increasing
understanding of plate techtonics.