INDEX TO VOLUME XX 
Stratigraphic Conformity and Unconformity, Dynamic Relations and 
Terminology of. By W. O. Crosby 
Stratigraphy of the Older Pennsylvanian Rocks of Northeveter Okla- 
homa, The. By D. W. Ohern. Review by A. E. F. 
Siissmilch, C. A. An Introduction to the Geology of New South 
Wales. Review by R. T. C. ahaa meee = : : 
Swedish Magnetites, Notes on the Geology of the! By D. H. Newland. 
Review by H. C. C. 
Terrestrial Magnetism, Department of, of the Carnegie Institution 
of Washington, Annual Report of the Director. By L. A. Bauer. | 
Review by A. E. F. 
Tertiary Deposits Near Coalinga Oil EF au ad Their Sora erapive Rela: 
tions with the Upper Cretaceous, Notes on. By E. T. Dumble 
Thermal Waters in the Yellowstone National Park, The Origin of the. 
By Arnold Hague. Review by A. E. F. 
Thomas, Herbert Henry. The Skomer Volcanic Sates (Srsaltyaalics 
shire). Review by A. W. Stickney ee ae ae ees eae 
Thousand Islands Region, Geology of the. By H. P. Cushing, H. L. 
Fairchild, R. Ruedemann, and C. H. Smyth, Jr. Review by 
ADE: i: : 
Topaz Bearing Roles ap hel hones Ramee, nUtale By H. B. 
Patton. Review by Harold E. Culver SUR abis or Ue een 
Triassic Fossils from Southeastern Alaska, Some. Wallace W. Atwood. 
Tripyramid Mountain, Geology of. By L. V. Pirsson and W. N. Rice. 
Review by A. W. Stickney 
Trueman, J.D. The Value of Certain Gritera for the Detention af 
the Origin of Foliated Crystalline Rocks. I 5 
The Value of Certain Criteria for the Determination of ile 
Origin of Foliated Crystalline Rocks. II . 
Umpleby, Joseph B. An Old Erosion Surface in Idaho: Its Age and 
Value as a Datum Plane : 
Untersuchungen tiber den geologischen Bau tia die TAS von Aragonin. 
By Adolf Wurm. Review by A. E. F. 
Uranium (Radio-active) Ores and Other Rare Metals and Minerals: in 
South Australia. Review by H.C. C. : 
Use of Symbols in Expressing the Quantitative Clascineation oi 
Igneous Rocks. By Whitman Cross . 
Van Hise, Charles Richard, and Charles Kenneth Leith. The Geology 
of the Lake Superior Region. Review by E. S. Moore 
Versuche iiber Umkristallisation von Gesteinen im festen Tristande: 
Von F. Loewinson-Lessing. Review by E. Steidtmann 
184 
190 
