CHAPTER V. 



STRUCTURAL AND HISTORICAL GEOLOGY OF THE 

 QUICKSILVER BELT.i 



General results — No attempt lias becu made in the present investigation 

 thoroughly to elaborate the general geology of the entire area in which 

 the quicksilver deposits occur, but, in addition to what lias been made 

 known by other geologists on this subject, it was found indispensable for a 

 proper discussion of the quicksilver deposits further to elucidate some of 

 the more important structural and historical relations of the rocks inclosing 

 them. Such focts bearing upon the general geology of these ore deposits 

 as are now known will be presented in this chapter in chronological ar- 

 rangement Their bearing will perhaps be clearer if the reader is at once 

 put in possession of some of tlie main conclusions reached, which areas 

 follows : 



The Coast Ranges experienced a great upheaval (the first traced) 

 probably about the close of the Neocomian, this being the same disturb- 



' Messrs. Antisell, BlaUc, and Newberry contributed valuable papers, containing information on the 

 geology of the Coast Ranges, to the Pacilie Kailioad reports. Under Professor Whitney, Messrs. 

 Brewer, Gabb, King, and others studied this area. Their results are to be found in the well known 

 publications of the California survey. Mr. Jules Marcou has also written on the subject, e.specially in the 

 Bulletin of the French Geological Society, vol. '2, 1883, p. 407, aud the Proceedings of the California 

 Academy of Sciences contain numerous pertinent papers. I have endeavored to make such use of this 

 material as seemed advisable. Dr. C. A. White has co-operatej with me iu the study of the general 

 geology of the region, his standpoint bojug that of the paleontologist. The importauco of some of 

 the results reached leil us to publish a part of them in advance of this memoir. The papers iu which 

 these were announced are: On the Mesozoic and Cenozoic Paleontology of California, by C. A. White 

 (Bull. U. S. Gool. Survey No. 15); On New Cretaceous Fossils from California, by C. A. White (Bull. 

 V. S. Geol. Survey No. -22), and Notes on the Stratigraphy of California, by G. F. Becker (Bull. U. S. 

 Geol. Survey No. 111). I have also used facts aud arguments adduced by me iu a paper entitled "The 

 relations of the mineral belts of the Pacific Slope to the great upheavals" (Am. Jour. Sci., 3d series, 

 vol 2S, ISSi, p. 2l19) aud iu Statistics and Technology of the Precious Metals, by S. F. Emmons and 

 G. F. Becker, Tenth Census Kepts. U. S., vol. 13, Chapter I. The present chapter also contains much 

 that is new. 



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