430 THE CRETACEOUS AND TEUTIARY GEOLOGY 



under the title: Contribuisoes para a Geologia da Regiao do Baixo Amazonas, pclo 

 Prof. Orville A. Derby, M.S. 



D'OjiBiGNT, Alcide.— Voyage dans les deux Ameriques, public sous la direction de M. Alcide D'Orbigny, Paris, 

 1859. 



Several references to Brazilian geology as made for pp. 120-185, but as this book 

 was intended for a popular work of travels, it contains nothing of importance upon 

 geology. On p. 185, it is remarked, however, that " le calcaire s'y trouve en bouconp 

 d'endroits." 



D'Orbigny, Alcide. — Voyage dans TAmerique Aleiidionale, Geologic et Cartes, Paris, 1843. 



The only maps referring to Brazilian cretaceous and tertiary geology are included 

 in Plate X, Figs. 1, 4 and 5. The text in which these general charts are explained 

 relates mainly to the geology of the River Plate basin, Patagonia and the "West Coast. 

 Though this publication represents a great deal of valuable geological details, it con- 

 tains a vast amount of speculation which, as far as Brazil is concerned, is of doubtful 

 value. There is nothing directly upon the Brazilian cretaceous and tertiary, but the 

 latter portion of the work, pp. 209 et seq., " considerations generals sur la Geologic de 

 TAmerique Meridionale," discusses the dynamic movements and building up of the 

 continent. Of the cretaceous terranes, he says (p. 233) : " Qu'ils sont tout a foit 

 inconnus aux regions orientales et centrales de I'Amerique Meridionale." The 

 mesozoic and tertiary geology of Brazil can best be understoood by a study of that 

 of the central and western parts of the continent, which he treats at some length, in 

 the Geologic and Paleontologie of his voyage. On p. 237, he discusses the existence 

 of the Jurassic in South America. 



D'Obbigny, Alcide.— Coinptes Rendus de I'Academie des Sciences, 1843, Vol. XV, p. 771. Considerations generales 

 et coup d'ceil d'ensemble sur les grands faits geologiques dans I'Amerique Meridionale a ete le theatre, par 

 Alcide D'Orbigny. 



The conclusions of this brief paper are highly imaginary. 



Duu.\ND, L'Anmi. — Considerations gijnerales sur rAmazone, par I'Abbo Durand. Bui. de la Soc. de Geograpliie, Paris, 

 Novembre, 1871. 



It is stated that the tertiary seems to be entirely wanting in the Amazon basin ; 



that the bottom of the basin is cretaceous, overlain by from seven to forty metres of 



clays, above which is a formation of sands, clays and gravels, which are referred to 



the "trias ou terrain de vieux gres rouge." A very wide distribution is attributed to 



this formation. 



Ethekidgk, R.— Notes on the Mollusca collected by C. Barriiigton Brown from the Tertiary Deposits of Solimoes 

 and Javary Rivers, Brazil, by R. Etheridgc. Quart. Jour. Geol. Soc, XXXV, 1879, p. 83. 



An appendix to Mr. Brown's paper, q. v., consisting of specific descriptions of 

 tertiary fossils. 



