 |
|
CRENULATIONS
Mount Abraham Mica-Schist
Addison County, Vermont
The ridges and valleys running from the upper right to the lower left of
this photograph are little wrinkles called crenulations. These small folds
of the planar fabric look like corrugated cardboard. The early fabric here
is made up of plates of mica (muscovite and paragonite) and long, opaque
ilmenite crystals. Find an ilmenite crystal that is bent around a
crenulation. Straighten it out in your imagination and estimate how much
this rock was shortened folding.
Crossed polarizers
|
