444 JOURNAL OF THE WASHINGTON ACADEMY OF SCIENCES VOL. 11, NO. 18 



Dr. Frederick Gardner Cottrell, National Research Council., 1701 

 Massachusetts Avenue, Washington, D. C. 



Prof. Robert Fiske Griggs, National Geographic Society and George 

 Washington University, Washington, D. C. 



Prof. Mayo D. Hersey, Massachusetts Institute of Technology, Cam- 

 bridge, Massachusetts. 



Dr. Earl S. Johnston, Maryland Agricultural Experiment Station, CoUege 

 Park, Maryland. 



Dr. E. Lester Jones, U. S. Coast and Geodetic Survey, Washington, D. C. 



Dr. Robert Hamilton Lombard, Geophysical Laboratory', Carnegie 

 Institution of Washington, Washington, D. C. 



Dr. Henry C. Macatee, 1478 Harvard Street, Washington, D. C. 



Dr. Richard Bishop Moore, U. S. Bureau of Mines, Washington, D. C. 



Dr. Robert W. SaylES, Geological Museum, Harvard University. 

 Cambridge, Massachusetts. 



Assistant Surgeon General J. W. Schereschewsky, U. S. PubUc Health 

 Service, Washington, D. C. 



Dr. Michael Shapovalov, Bureau of Plant Industr>% U. S. Department 

 of Agriculture, Washington, D. C. 



Dr. Edwin Emery Slosson, Science Servdce, 1701 Massachusetts Avenue, 

 Washington, D. C. 



GEOLOGICAL SOCIETY 



,353d meeting 

 The 353d meeting of the Geological Society of Washington was held in the 

 auditorium of the Cosmos Club at 8 p.m. on Wednesday, January 12, 1921. 



Regular Program 



H. G. Ferguson: Lode deposits of Manhattan, Nevada. (Illustrated with 

 lantern slides.) 



C. N. Fenner: Structural and volcanic geology of the Katmai region, Alaska. 

 (Illustrated with lantern slides.) This paper has been published.^ 



H. D. Miser: Llanoria, the Paleozoic land area in Louisiana and eastern 

 Texas. 



Evidence for a Paleozoic land area that occupied at least a part of Louisiana 

 and eastern Texas has been published from time to time by different geologists. 

 The most important paper on the subject is one by J. C. Branner, published 

 in the American Journal of Science in 1897. Considerable information on 

 the subject was obtained by the late Dr. A. H. Purdue and the writer during 

 several years' study of the rock formations in the Ouachita Mountains and 

 Arkansas Valley of Arkansas and Oklahoma, beginning in 1907. The follow- 

 ing conclusions are based on this information and on the data published by 

 other geologists. A land area which has been called Llano by Willis, Schu- 

 chert, and Ulrich, and Llanoria by Dumble and Powers, existed in Louisiana 

 and eastern Texas during much, if not most, of the Paleozoic era, and during 

 the Triassic and Jurassic periods of the Mesozoic era. It varied in outline 

 from time to time. It may have occupied a part of the area of the present 

 Gulf of Mexico; at times it was doubtless connected with large land areas 



1 Journ. Geol. 28: 569-606. 1920. 



