File:The Quarterly journal of the Geological Society of London (13205969443).jpg

256
PROCEEDINGS OF THE GEOLOGICAL SOCIETY. .Mar. 10,
Orthis, several species,
(testudinaria? striatula? &c.)
Atrypa.
Lingula, one species.
Delthyris.
Encrini.
Graptolites, two species.
And an abundant variety of corals
of several genera and species.
Cystolites ornatus.
Strophomena sericea.
nasuta ?
Orthoceras, more than one species.
Trochus .
Pterinea carinata.
Cypricardia angustifrons.
^lor^ ovata.
■ Orbicula ?
Some of the above were remarkably well preserved in the marl,
which is here almost entirely an argillaceous deposit. The Trinucleus,
which at other elevations is seen only with its singularly-formed
buckler, so highly ornamented, was here found attached to its pos-
terior ribs, and with delicately sharp spinous projections from each
end of the buckler nearly an inch in length. Triarthrus Beekii,
which in the lower part of the deposit has generally presented a head
merely, or the ribs unconnected with a head, was here completely
perfect. Lingulae were in nearly every instance found, not parallel
with the strata, but standing up, as if they had been entombed while
growing in their usual position, and so quietly as not to disturb or
throw them down. Calymene
were seldom found rolled up,
or distorted in any way, and
a dozen were sometimes seen
on one side of a slab of marl
four or five inches square, all
beautifully spread out as if in-
tended for cabinet specimens
by nature herself. The 7*o-
teles megistos exhibited both
spinous terminations of the
shield well-defined. Grap-
tolites were in the greatest
abundance, and one species
was peculiarly delicate and
hair-like ; in short, all were
preserved in primaeval perfec-
tion, untouched by the cor-
roding tooth of Time.
The most interesting of all
were the Orthocerata, which
were frequently of unusual
size, measuring over three feet
in length ; they all appeared
more or less compressed as if
by the weight of the super-
imposed strata, and their dia-
meter when thus flattened was
frequently over six inches.
The surface was often coated