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BEITISH STRATIFIED SYSTEMS,

TO WHICH THE FOLLOWING SKETCHES MOBE ESPECIALLY REFER.

The subjoined tabulation exhibits the arrangement of the British stratified rocks, as accepted by our leading geologists—minor and local deviations of superposition being subordinated for the sake of distinct comprehension and ready reference:—

Systems.
Quaternary.

Tertiary.

Cretaceous.

Oolitic.

Triassic.
Permian.

Carboniferous.

[blocks in formation]

Old Red Sand-
Stone.

Silurian.

Cambrian.
Laubentian.

!In progress.
Recent.
C Pleistocene. ) Cainozoic.

1 Pliocene.
) Miocene.
'Eocene.
I Chalk.
I Greensand.
( Wealden.

j Oolite. ) Mesozoic.

'Lias.

( Saliferous Marls,
j Muschelkalk (?)
( Upper New Red Sandstone,
j Magnesian Limestone.
( Lower New Red Sandstone.
! Coal-Measures.
) Millstone Grit.
J Mountain Limestone.
'Lower Coal-Measures.
Yellow Sandstones.
Devonian Limestones and

Slates. > Paleozoic.

Red Sandstones, Conglom-
erates, and Cornstones.
Grey fissile Sandstones
(" flagstones ") and Con-
glomerates.
; Upper Flags, Shales, and
) Limestones.
/ Lower Grits and Slates.
Slates, Schists, and Grits, v
Gneissic Schists, Quartz- S.EOZ0IC.
ites. and Serpentines. J

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OEDEE AND SUCCESSION OF LIFE,

ESPECIALLY AS REFERRED TO IS THE FOLLOWING SKETCHES.

The subjoined tabulation exhibits proximately the stages at which the great ascending sections of Plants and Animals make their first appearance in tho stratified systems:—

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Man. Plants and animals of
I existing species and distribu-
I tion; a few genera recently
extinct.

(Placental mammals. Plants
and animals of existing or-
ders; a large proportion,
however, of extinct genera
and species.

Marsupial mammals, birds,
reptiles, fishes, shell - fish,
crustacea, zoophytes; palms,
coniferee, ferns, lycopods,
sea-weeds.

(Marsupial mammals, birds,
reptiles, fishes, shell - fish,
crustacea, zoophytes; palms,
cycads, coniferee, ferns, ly-
copods, sea-weeds.

Reptiles, fishes, shell-fish, crus-
tacea, zoophytes; coniferee,
ferns, lycopods, sea-weeds.

Fishes, shell-fish, crustacea,
I zoophytes; ferns, lycopods,
'sea-weeds.

! Shell-fish, crustacea, worm-
j tracks, zoophytes; sea-weeds.

I Crustacea, worm-burrows, and
j zoophytes.

[ Traces of lowly or foramini-
I feral organisms.

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