we've been looking at the mylonites
that were deformed in the deeper crust
but if you think about it as these rocks
were carried closer to the Earth's
surface they would have cooled off and
as they cool off
they wouldn't have deformed in the same
way gradually they would become brittle
rather than ductile so let's take a look
at the opposite side of the road where
we can see better what happened to these
rocks as they approached the surface so
again at the base of this outcrop we're
seeing the same mylonites that we saw
across the road but when you get up
close and look at them you'll see
they're fractured they are broken up or
brecciated they're deformed into angular
bits of rock so as these mylonites
were coming up you see a brittle on
ductile superposition or overprinting of
the brittle behavior on the earlier
ductile behavior
now as the same time that these rocks
were being deformed at the surface you
had mountains being uplifted gravel
eroding off the mountains than being
deposited on top and that gravel is what
we see at the top of this outcrop
