File:The Quarterly journal of the Geological Society of London (12471127123).jpg

PROCEEDINGS OF THE GEOLOGICAL SOCIETY,
.Nov. 9,
In the Blue MotiRtain dis-
trict, where the hills rise to.
about 7350 feet, and present a
most broken surface, the strata
are so excessively disturbed, sc
traversed and scmi-metamor-
phosed by dj-kes of syenite,
and mixed up with porphyritic
masses, that it is impossible to
resolve the intricacies of the
stratification, or to determine
the sequence of the beds inter
se, without a lengthened and
detailed investigation. But in
the parish of Clarendon it is
manifest that igneous rocks,
presenting many interesting
phases, but all appertaining to
the porphyritic type, form the
hase of the stratified series. On
such rocks the Cretaceous beds
are deposited, and are often
found raised to an angle of
from 40° to 50°. The lowest
member of the Cretaceous
series frequently consists of a
thin bed of conglomerate
formed of the harder materials
of the ..orphyries. It is suc-
ceeded by massive compact
limestones enclosing fossils of
the Ilippurite family (Bar-
rettia monilifera, Woodw.), so
solidly imbedded as to prohibit
simple extraction. The lime-
stones are succeeded by marls
and calcareous sandstones,
from which most of the Hippu-
rites, Corals, Orbitoides, Acteo-
nellce, &c., have been obtained.
The Hippurites are the only
abundant organic remains. It
is uncertain whether these
strata should form a single
series, or be divided into an
inferior and superior group.
Their combined thickness may
amount to 500 or 800 feet.
Extensive disturbances have
ulmost invariably broken up
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