RECORD: Darwin, C. R. n.d. Abstract of De la Beche, Researches in theoretical geology. CUL-DAR42.175. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 1.2022. RN1

NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin. The volume CUL-DAR42 contains notes for Darwin's book South America (1846).

De La Beche Henry Thomas. 1834. Researches in theoretical geology. London: Charles Knight.

A900


[175]

Bed of super-cretaceous conglom: upheaved from line of Righi & Alps at Impelarang

P. 207 (as porph-Breccia from Andes.) P. 199. De la Beche

Upper part of super cretaceous strata with cap irregular of gravel - at Bovey

P 190: also at Nice common in all the Sections

P. 201; 2; 3, This latter is generally the case, in whole base of Maritime Alps.— Clay (alternating sometimes, & this is important) capped by gravel:

= The sub-Alpine strata appear perhaps to have same relation of pebbles & sand.

P 207. Sedgwick

= Same thing also seems to occur at S. of France. Marcel de Serres. P 218

= The Covering of chalk flints in London Clay is fact of same class.

= strata not near mountains as they rose would probably be capped with sand:— (P 246)

[175v]

Supercretaceous beds, more mechanical in England, than the corresponding ones in France. P 238 (because nearer to high land. - And the Paris basin nearer to Volcanoes of Central France - which were active at this time. - at time of Calcaire grossier active??

Coarse pisolitic structures in some Supercretaceous limestone: analogy with St. Jago

If my view of all conglomerate (with wood) being near land: then these not possessing bones renders it probable that Mammalia did not exist.

=

Notices that Beaches only form fringe round Continents & do not extend far from the shore: That soundings, pebbles on NW Coast of Ireland were encrusted by Seruplæ.

P 76.- Does not give any cause why beaches generally front low country.

it is because for long periods currents remain constant, either removing material or not, in latter case forming Cliffs

=

Says Waves do not act at greater depths than 15 Fathom P. 81

Siliceous Springs. Azores. P 134

partly if System become

=

Jamaica. Sandwich Isd raised beach of a coral: Isle of France between Lava beds: also at Couper & Timor M. Quoy & Gaimard. - No circular Islands in West Indies. P 142

=

M. Lesson upraised beaches at Concepciòn

P 152. M. Brongiart L'Ecorce de globe

=

M De la Beche shows that recently in S. Britain has been small upheaval & depression of ground. =

Cleveland geolog of United States

p 638 in upper unconsolidated beds a Maclurina with shells & shark teeth, bed of gravel.

Lyell says most of the subappenine strata capped with gravel

{It has been remarked that conglomerates separate distinct formations, this harmonize beautifully with subsided Patagonia for such would be the case

(See Santiago Note Book p. 8—10 to 14 some speculations) 

{Effects of depression driving before it beaches of pebbles. - rounding escarpments

p. 17 Santiago Note book


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Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)

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