[1]_Granite_ is a type of igneous rock consisting of large interlocking
grains of light-colored minerals. Rocks are classified as being
either igneous, sedimentary, or metamorphic. _Igneous_ rocks form by
the solidification of molten material; _sedimentary_ rocks form by
the accumulation of sediments derived from older rocks; and
_metamorphic_ rocks form by the recrystallization of older rocks
under conditions of high temperatures and pressures.
[2]_Dip_ is the inclination of a surface as, for example, a joint
surface described above.
[3]_Schist_ is the name given to rocks in which the minerals have a
parallel alignment due to reorganization of the rock constituents
during a condition of high temperature and pressure. The platy
minerals, like mica, form at right angles to the pressure so that
the resulting rock may have a “bedded” appearance.
[Illustration: Looking northwest over Groton Pond toward Owlshead
Mountain]
[Illustration: Looking north over Groton Pond toward Little Deer
Mountain]