Digby Neck and Islands are a westerly extension of the North
Mountain basalt ridge. This ridge, deposited ca 190 mya, is
composed of several basaltic flows. Seventeen flows have been
identified but along Digby Neck and Islands, only two very thick
ones are found. They are separated by a layer of more easily eroded
rock which forms a 'valley' down the centre of the neck and out
into the Islands.
As the lavas cooled after extrusion, escaping gases were trapped
in the rock and formed cavities called amygdules, into which
various minerals precipitated. Examples include amethyst, agate,
jasper, calcite, and many members of the zeolite family.
Also when the thick lava flows cooled, they contracted forming
polygonal columns. When these columns are undercut by the sea, they
tend to form high cliffs. On Brier Island, the most spectacular
display of basalt cliffs is along the southern shore. Located at N
44° 15.016 W 066 ° 20.888 they can be observed to the SW of the
posted coordinates. Please mind the nearby NO TRESPASSING
signs.
In order to claim this Earthcache
please post a picture of you and/or your GPS with the basalt cliffs
in the background. Please e-mail to me the approximate height of
the cliffs.
You DO NOT need to wait for confirmation
from me to log your find. Logs not meeting the requirements will be
deleted
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