REVIEWS 71 



The earlier andesite has suffered extensive alteration, near the veins to 

 quartz,, sericite, and adularia; farther aw^ay to calcite and chlorite. The 

 principal work of the altering waters was the formation of the veins. A 

 detailed account of these changes is given, and a study of typical specimens 

 leads to the conclusion that these waters were charged with an excess of sil- 

 ica and probably potash, with gold, silver, antimony, arsenic, copper, lead, 

 zinc, sodium, sulphur, some chlorine and fluorine; but were notably defi- 

 cient in iron. By comparison and microscopic studies of the later ande- 

 site it is concluded that these altering waters were charged with carbonic 

 acid and sulphuretted hydrogen, and contained magnesia, iron and lime. 



The composition of the waters indicated above does not seem to 

 correspond to the composition which waters descending through the rock 

 would have had. An eruption of andesite, followed by highly siHceous and 

 potassic waters, deficient in iron, and an eruption of rhyolite followed by 

 waters rich in lime, magnesia, and iron, present an antithesis which may 

 give, according to the author, some clew to the origin of the waters. Two 

 hypotheses of this origin are considered, an atmospheric and a magmatic. 

 The author favors the latter view. 



Besides a detailed discussion of the above-mentioned facts, Mr. Spurr 

 has chapters on the descriptive geology of the several mines and prospects ; 

 the increase of temperature with depth in the mines, and concludes the 

 report with a comparison of similar ore deposits elsewhere. F. D. M. 



Stratigraphy and Paleontology of the Upper Carboniferous Rocks of 

 the Kansas Section. By George I. Adams. (Bulletin of the 

 U. S. Geological Survey, No. 211, 1903, pp. 1-72.) 



Tabulated List of Invertebrate Fossils from the Carboniferous Section 

 of Kansas. By George H. Girty. (Bulletin of the U. S. 

 Geological Survey, No. 211, 1903, pp. 73-83.) 



Summary of the Fossil Plants Recorded from the Upper Carboniferous 

 and Permian Formations of Kansas. By David White. (Bul- 

 letin of the U. S. Geological Survey, No. 211, 1903, pp. 85-117.) 



Notes on the Permian Formations of Kansas. By Charles S. 

 Prosser. (American Geologist, Vol. XXXVI, 1905, pp. 142-61.) 



Several important contributions have been made lately to our knowl- 

 edge of the much-debated section of the Upper Carboniferous of Kansas. 



The standard Carboniferous Section for America may be regarded as 

 the one which is so fully displayed in the Mississippi valley. It is in Kan- 



