*
[footnote] *Quenstedt, 'Flotzgebirge Wurtembergs', 1843, s. 135.
It appears, from what we now know of this subject, that the waters must have
been inhabited at the same epoch, and in the most widely-remote districts of
the world, by shell-fish, which were at any rate, in part, identical with
the fossil remains found in England. Leopold von Buch has discovered
exogyra and trigonia in the southern hemisphere (volcano of
p 277
Maypo in Chili), and D'Orbigny has described Ammonites and Gryphites from
the Himalaya and the Indian plains of Cutch, these remains being identical
with those found in the old Jurassic sea of Germany and France.
The strata which are distinguished by definite kinds of petrifacations, or
by the fragments contained within them, form a geognostic horizon, by which
the inquirer may guide his steps, and arrive at certain conclusions
regarding the identity or relative age of the formations, the periodic
recurrence of certain strata, their parallelism, or their total suppression.
If certain strata, their parallelism, or their total suppression. If we
classify the type of the sedimentary structures in the simplest mode of
generalization, we arrive at the following series in proceeding from below
upward:
1.
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