The red notebook of Charles Darwin / edited, with an introduction and notes by Sandra Herbert.

  • Charles Darwin
Date:
1980
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Licence: Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)

Credit: The red notebook of Charles Darwin / edited, with an introduction and notes by Sandra Herbert. Source: Wellcome Collection.

    115/184 (page 101)
    NOTES 101 Lyell, Principles of Geology, vol. 3, p. 371: [According to M. Elie de Beaumont]... near Champoleon [in France], a granite composed of quartz, black mica, and rose-coloured felspar, is observed partly to overlie the secondary rocks, producing an alteration which extends for about thirty feet downwards, diminishing in the inferior beds which lie farthest from the granite.... In the altered mass the argillaceous beds are hardened, the limestone is saccharoid, the grits quartzose, and in the midst of them is a thin layer of an imperfect granite. It is also an important circum¬ stance, that near the point of contact both the granite and the secondary rocks become metalliferous, and contain nests and small veins of blende, galena, iron, and copper pyrites. 123 pitton, ' Geology' as quoted in note 47. Lesson and Garnot, Voyage autour du monde.. .Zoologie, vol. 1, part 1, p. 5: Toutes les côtes de la Nouvelle-Galles du Sud [New South Wales] sont, en effet, entièrement composées d'un grès houiller à molécules peu adhérentes; et ce que nous appelons le premier plan des montagnes Bleues est également composé de ce grès, qui cesse entièrement au mont York. Là, une vallée profonde isole ce premier plan du second, qui est composé en entier de granite. Lesson and Garnot, Voyage autour du monde. . . Zoologie, vol. 1, part 1 [1826] and part 2 [1828]. The following citations pertain to the entire paragraph on p. 102 of the notebook : On the formations of Payta see part 1, pp. 260-261 : Le lambeau de sol tertiaire se compose de couches ou bancs alternatifs, dont voici l'énumération, en commençant par la formation de phyllade qui le supporte. 1° Roches talqueuses phylladiformes, terrain primordial. 2° Argiles plastiques. — Sable argileux, schisteux, traversé par des veines entrecroisées de gypse fibreux... 3° Calcaire grossier.. . Rock cleavage is described as running from east to west on p. 260. On p. 262 Lesson uses the figure 200 feet in describing the change in sea level which would have caused such configura¬ tions of strata as seen at Payta. With respect to volcanic formations on the north part of New Zealand, there is Lesson's remark in part 2, p. 410 that De nombreux volcans, dont les traces des éruptions sont récentes, existent sur plusieurs points de ces îles [off the north shore of the North Island]. . .Aussi trouve-t-on communément des pierres ponces.. . . With respect to richness of plant genera in New Zealand see the quotation from Lesson in note 80. On St Catherine's see part 1, p. 189: Le granite forme entièrement la croûte minérale de l'île de Sainte-Catherine et du continent voisin On the Falkland Islands see part 1, p. 198-199: Les couches se composent de feuillets fendillés dans tous les sens, dont la direction, au lieu d'être horizontale, est presque verticale, et forme particulièrement sur le pourtour de la baie un angle de 45 degrés: ceux de la grande terre se dirigent à l'Est, et ceux des îlots aux pingoins à