Next
Dinesh

Dinesh club

Posted: 20 Aug 2023

Taken: 20 Aug 2023

0 favorites     2 comments    6 visits

See also...

Keywords

282 •
Image / Excerpt •
On the Origin of Species •
150th anniversary •
Illustrated Edition •

Authorizations, license

Visible by: Everyone
All rights reserved
6 visits

this photo by Dinesh

Comments
 Dinesh
Dinesh club
He who most closely studies the action of the sea on our shores, will, I believe, be most deeply impressed with the slowness with which rocky coasts are worn away. The observations of this head by Hugh Miller, and by that excellent observer Mr. Smith of Jordan Hill, are most impressive. With the mind thus impressed, let any one examine beds of conglomerate many thousand feet in thickness, which though probably formed at a quicker rate than many other deposits, yet, from being formed of worn and rounded pebbles, each of which bears the stamp of time, are good to show how slowly the mass has been accumulated. Let him remember Lyell’s profound remark, that the thickness and extent of sedimentary formations are the result and measure of the degradation which the earth’s crust has elsewhere suffered. And what an amount of degradation is implied by the sedimentary deposits of many countries! Professor Ramsay has given me the maximum thickness, in most cases from actual measurement, in a few cases from estimate, of each formation in different parts of Great Britain; and this is the result : -

Palaeozoic strata

(not including igneous beds) … 57,154

Secondary Strata . . . . . . . . . . . . 13,190

Tertiary strata . . . . . . . . . . . . . . . . 2,240

-- making altogether 72, 584 feet; that is, very nearly thirteen and three-quarter British miles. . . . Page 282
9 months ago. Edited 9 months ago.
 Dinesh
Dinesh club
On the ORIGIN 0f SPECIES
9 months ago.

Sign-in to write a comment.