The Geologic Formations of California: With Reconnaissance Geologic Map (Classic Reprint) - Tapa blanda

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Excerpt from The Geologic Formations of California: With Reconnaissance Geologic Map

A quarter of a century has passed since the preparation of the Preliminary Geological Map of California, published by the California State Mining Bureau in 1891.

The State Mineralogist, Mr. Fletcher Hamilton, was resolved to signalize the end of the second quarter of a century of studies in the geology of California by taking stock, and Showing what we have done in that period. The writer agreed, at his request, to sum up all the available information in map form. This Bulletin, with the Reconnaissance Geologic Map of California that accompanies it, is essentially a report of progress for this period. He is well aware that there are many imperfections. Certain areas have not been mapped at all, and others only in a general way. Also there is much information buried in unpublished notes and maps of private indi viduals and corporations that would materially improve the map, if it' were available. Such unpublished material as could be Obtained has been used, along with the much greater mass of published informa tion in maps and descriptive papers in the publications of the United States Geological Survey, California State Mining Bureau, California Academy of Sciences, Bulletins of the Department of Geology of the University of California, and the various scientific publications of America and foreign countries.

This last quarter of a century has been made notable for California by the mapping of the Gold Belt by the U. S. Geological Survey, by II. W. Turner, Waldemar Lindgren, J. S. Diller and F. 'l. Ransome; by areal mapping in the Coast Ranges by A. C. Lawson, J. C. Branner, H. W. Fairbanks and R. Arnold; by the detailed mapping Of the oil fields by R. Arnold, H. R. Johnson, F. M. Anderson, and R. Anderson; by the stratigraphic work in the Klamath Mountains of J. S. Diller and O. H. Hershey; by the studies in the continental formations by J. C. Merriam in the desert regions, and by W. Lindgren in the Tertiary river deposits.

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