FRANKLIN K. LANE, Secretary UNITED STATES GEOLOGICAL SURVEY Bulletin 660 CONTRIBUTIONS TO ECONOMIC GEOLOGY 99 NOTE.-The Survey's annual volumes entitled "Contributions to economic geology are issued in parts, and the last part will include a volume titlepage, table of contents, and index for the use of those who may wish to bind the separate parts. A small edition of the bound volume will also be issued, but copies can not be supplied to those who have received all the parts. CONTENTS. [The letters in parentheses preceding the titles are those used to designate the papers for Page. (C) Manganese deposits of the Caddo Gap and De Queen quadrangles, Ark., 59 (E) Louisiana clays, by G. C. Matson (published Nov. 26, 1917) (F) Ore deposits of the northwestern part of the Garnet Range, Mont., by (J) Possibilities for manganese ore on certain undeveloped tracts in Shenan- doah Valley, Va., by D. F. Hewett, G. W. Stose, F. J. Katz, and H. D. Miser PLATE I. Map of east-central Minnesota showing the location of the Cuyuna 2 II. Sketch map of New Jersey and parts of Maryland and Virginia, 36 64 IV. Map showing location of deposits of tin ore in Kings Mountain dis- 124 V. Map showing the distribution of clay-bearing formations in Loui- VI. Geologic map and section of the northwestern part of Garnet 148 |