remarks, remarks, 1860 1861 1866 1869 1872 | remarks; 1859 |
and to show how liable we are to error in supposing that whole groups of species have suddenly been produced. ↑1 blocks not present in 1859 1860; present in 1861 1866 1869 1872 | Even in so short an interval as that between the first and second editions of Pictet's
great work on Palæontology, published in 1844-46 and in
1853-57, the conclusions on the first appearance and disappearance of several groups of animals have been considerably modified; and a third edition would require still further changes.
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I may recall the well-known fact that in geological treatises, published not many years ago,
the great class of mammals was the great class of mammals was 1859 1860 |
the whole class of mammals was 1861 1866 |
mammals were 1869 1872 |
always spoken of as having abruptly come in at the commencement of the tertiary series. And now one of the richest known accumulations of fossil
mammals, mammals, 1860 1861 1866 1869 | mammals 1859 1872 |
for its thickness, belongs for its thickness, belongs 1860 1861 1866 1869 |
belongs 1859 1872 |
to the middle of the secondary series; and
one one 1859 1860 1861 | one 1866 1869 1872 |
true
mammal mammal 1859 1860 1861 | mammals 1866 1869 1872 |
has has 1859 1860 1861 | have 1866 1869 1872 |
been discovered in the new red sandstone at nearly the commencement of this great
series. series. 1859 1860 1861 1869 1872 |
series. Cuvier used to urge that no monkey occurred in any tertiary stratum; but now extinct species have been discovered in India, South America, and in Europe, as far back as the miocene stage. 1866 |
Cuvier used to urge that no monkey occurred in any tertiary stratum; but now extinct species have been discovered in India, South America, and in
Europe Europe 1859 1860 1861 | Europe, 1869 1872 |
even even 1859 1860 1861 | even 1869 1872 |
as far back as the
eocene eocene 1859 1860 1861 | miocene 1869 1872 |
stage. Had it not been for the rare accident of the preservation of footsteps in the new red sandstone of the United States, who would have ventured to suppose
that, that, 1860 1861 1866 1869 | that 1872 |
besides reptiles, besides reptiles, 1860 1861 1866 1869 | besides reptiles, 1872 |
no less than at least thirty
kinds of birds, kinds of birds, 1860 1861 1866 1869 |
different bird-like animals, 1872 |
some of gigantic size, existed during that period?
Not a fragment of bone has been discovered in these
beds. Notwithstanding that the number of joints shown in the fossil impressions correspond with the number in the several toes of living birds feet, some authors doubt whether the animals which left the impressions were really birds. beds. Notwithstanding that the number of joints shown in the fossil impressions correspond with the number in the several toes of living birds feet, some authors doubt whether the animals which left the impressions were really birds. 1860 |
beds. 1861 1866 1869 1872 |
Until quite recently these authors might have maintained, and some have maintained, that the whole class of birds came suddenly into existence during
an early tertiary an early tertiary 1860 1861 |
the eocene 1866 1869 |
period; but now we know, on the authority of Professor
Owen Owen 1860 | Owen, 1861 1866 1869 |
(as may be seen in Lyells Manual), (as may be seen in Lyells Manual), 1860 |
OMIT 1861 1866 1869 |
that a bird certainly lived during the deposition of the upper
greensand. greensand. 1860 | green-sand. 1861 | greensand; 1866 1869 |
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