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| Keywords: The Quarterly journal of the Geological Society of London (13860240124).jpg 332 <br> G ATTWOOD ON THE GEOLOGY <br> Yig 4 Sketch of Augite-Andesite with Country Rock adhering to it <br> from the surface near the San Rafael tunnel in the Aguacate <br> Mountains <br> of coal have been discovered The coal is in three conditions one <br> in which the coal is compact and in which there is little trace of <br> vegetable structure ; another in which the plants are partially <br> carbonized; and a third which shows the structure of plants pro- <br> bably dicotyledonous The coals may be called lignites ; they are <br> highly pyritized and contain in many places beautiful white crys- <br> tals of melanterite also pieces of jet <br> Near the coal and often adhering to it are found bands of horn- <br> stone or chert of a yellowish-brown colour <br> The coal-deposits have not been explored thoroughly and but <br> little is known at the present time about their extent From a <br> knowledge of the contour of the country and of the surrounding <br> rocks I consider it probable that the coal-deposits extend over a <br> limitod area only <br> We now come to a series of ancient lakes now valleys whose <br> waters have been tapped by the Rio Grande on the Pacific slope <br> and by the Rio Reventazon on the Atlantic slope fig 5 The old <br> water-lines on the mountain-sides and on the hills once small islands <br> in the valleys of Alajuela San Jose and Cartago are very marked <br> and distinct <br> The country rock is the same as above and continues to within a <br> few miles of Cartago Augite-andesite boulders are found on both <br> sides of the dividing ridge ; and in the valleys of San Jose and <br> Cartago boulders of trachytic rocks are met with <br> Large deposits of a fine-grained soft stone are found collected in <br> some of the ravines near San Jose and Cartago having a general <br> white ground but tinged with yellow red and magenta in fantastic <br> forms This was found to be a silicate of alumina highly im- <br> pregnated with iron oxides; in places the stones are kaolinized <br> and resemble lithomarge <br> Near this latter rock are found more or less connected with it <br> masses of hard white porcelain-clay resembling kaolin or even <br> lithomarge 36936125 113692 51125 Page 332 Text 38 http //www biodiversitylibrary org/page/36936125 1882 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 38 1882 Geology Periodicals Smithsonian Libraries bhl page 36936125 dc identifier http //biodiversitylibrary org/page/36936125 smithsonian libraries Information field Flickr posted date ISOdate 2014-04-15 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13860240124 2015-08-26 07 55 08 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1882 Photos uploaded from Flickr by FĂŚ using a script | ||||
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