Page - 344 - in The Origin of Species
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Text of the Page - 344 -
314 ORIGIN OF SPECIES
age, was deposited during a c?.*:i.-ird cscfZsr:!?:: of
and ditts gained ctmsiderakie thirkness.
An geologica] facts tell ns plaiohr that each 3.rt3. -3^ under-
gonenameroas 5lo"w osciilations of level, and ^.r^Mrentlv these
oscillaticHis bave asected wide spaces. Coaisectienthr, foraaft-
tions rich in fossils and sofBaently thick and extensile to
resist snhsequient degradaticm, will have been :£cKined otO"
wule spaces dnring periods ci subsidence, bet only wirere tiie
supply of sediment was sufficient to keep the sea sbaDow and
to embed and preserve the resnains before tfaey had time to
decay. On die other hand, as l(Xig as the bed of the sea
remains stationary, tkick deports cannot have been accnoni-
tated in the shallow parts, which are the most favoarafaie to
Hfe. Still less can this have ha£^>ened cfaning the ahemate
periods of elevation: or, to speak more accnratdy, tfse be<^
which "w^re then acctmmlated will geaerally have beoi de-
stroved bv being C5)raised and toongfat within the famits of
the coast-action.
These remarks apply chieSy to Uttoral and snb-Iittoral de-
posits. In the case of an extensive and^bDow sea, snch as
that within a large part of the Malay .\rchipelago, where the
depdi varies from 30 or 40 to 60 fathcHns, a wid>dT extended
formation might be formed dnring a period of deration, and
yet not suffer excessively from denodation daring its slow
iq^ieaval; bat the thickness of the formation could not be
great, fcr owing to the elevarory movemsit it wookl be less
than the depth in which it was formed: norwould the deposit
be much consolidated, nor be capped by overlying formatiaasy
so that it wcnli rm a good chance of being worn away by
atmospheric degradation and by the action of the sea during
subsequent oscillaticns of leveL It has. however, been sug-
gested by Mr. Hopkins, that if one part of the area, after
rising and before being denuded. subsMied. the deposit formed
dtrrins^ the rising movement, thoogfa not thick, might after-
wards become protectef '" " ""esh accumulatioas. and thus be
preserved for a longper
Mr. Hopkins also expresses his belief that sedmtentarj beds
of considerable horizontal extent have r^- '
tij
destroyed. Bet all geologists, excepting _; :. "^
that our present metamorphic schists and pltttomc r . -.- :ice
back to the
book The Origin of Species"
The Origin of Species
- Title
- The Origin of Species
- Author
- Charles Darwin
- Publisher
- P. F. Collier & Son
- Location
- New York
- Date
- 1909
- Language
- English
- License
- PD
- Size
- 10.5 x 16.4 cm
- Pages
- 568
- Keywords
- Evolutionstheorie, Evolution, Theory of Evolution, Naturwissenschaft, Natural Sciences
- Categories
- International
- Naturwissenschaften Biologie
Table of contents
- EDITOR'S INTRODUCTION 5
- AN HISTORICAL SKETCH of the Progress of Opinion on the Origin of Species 9
- INTRODUCTION 21
- Variation under Domestication 25
- Variation under Nature 58
- Struggle for Existence 76
- Natural Selection; or the Survival of the Fittest 93
- Laws of Variation 145
- Difficulties of the Theory 178
- Miscellaneous Objections to the Theory of Natural Selection 219
- Instinct 262
- Hybridism 298
- On the Imperfection of the Geological Record 333
- On the Geological Succession of Organic Beinss 364
- Geographical Distribution 395
- Geographical Distribution - continued 427
- Mutual Affinities of Organic Beings: Morphology: Embryology: Rudimentary Organs 450
- Recapitulation and Conclusion 499
- GLOSSARY 531
- INDEX 541