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- During the Jurassic Period, Arran was at a latitude of 39oN.
The Jurassic rocks found on Arran were deposited during the Liassic sub-division
of the Jurassic . Unfortunately the Jurassic rocks found on Arran are not in
situ, i.e. in the position of deposition. They are represented in blocks of rock
that have fallen into a volcanic vent that was active during the Tertiary, so
they are not in their original location, however, they were deposited on the
Arran land mass. The Liassic rocks of the Jurassic, found on Arran are found
in the Allt nan Dris burn near Balmichael Farm, close to Shiskine village. They
consist of marine clays and sands and have yielded an interesting selection of
Liassic fossils (Gunn 1903, re printed 1998, Warrington et. al., 1980)
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