Image from the Biodiversity Heritage Library.
Contributed by Yale Peabody Museum of Natural History.
| www.biodiversitylibrary.org
Transcription
Put up at 'The Maples' at Castleton, at
$3.00 per day.
As there are no granitic injections near the Ruskland area, about 30 miles (see p. distance)
the intense metamorphism is due to regional
deformation. If Doleritt's estimates of the thickness
of the Cambrian is correct the load of the Paleogries
may have been 3 miles thick, but finally much less.
Leith thinks that the evidence points to deformation
during the Appalachian orogeny, and that the
mass a mile or more thick was shoved over the
Ruskland area helping to cause further meta-
morphism. Since then the core has been worn away
revealing the intense metamorphism. Then too it is
clear that the attraction increases from east to
west.
In the Bird Lines at Taconics the Lower
Cambrian quartzites are thicker, 600 feet a mile,
they thin out and in Conn. are only a few feet
thick. Their greater mass as erosion intrudes