X BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Page 



Faunal zones of the Oligocene ; by B. L. Clark 100 



Climate and its influence on Oligocene faunas of the Pacific 



coast ; by Roy E. Dickekson 100 



Register of members and visitors at Stanford meeting, 1917 100 



Experiment in geology ; Presidential address by Frank D. Adams 107 



Post-Glacial uplift of northeastern America ; by H. L. Fairchild 187 



Explanation of the abandoned beaches about the south end of Lake Michi- 

 gan ; l)y G. F. Wright 2:^') 



Age of the American Morrison and East African Tendaguru formations ; 



by Charles Schuchert 245 



Meganos group, a newly recognized division in the Eocene of California : 



by B. L. Clark 281 ^ 



Marine Oligocene of the West Coast of North America ; by B. L. Clark 



and Ralph Arnold 207 



Amsden formation of the east slope of the Wind River Mountains of Wy- 

 oming and its fauna ; by E. B. Branson and D. K. Greger 300 



Stratigraphy of the New York Clinton ; by G. H. Chadwick. . .* 327 



Scope and significance of paleo-ecology ; by F. C. Clements 300 



Precambrian sedimentary rocks in the highlands of eastern Pennsylvania ; 



by E. T. Wherry 375 



Fluorspar in the Ordovician limestone of Wisconsin; by R. M. P>agg 303 



Adirondack anorthosite ; by W. J. Miller 300 



Field relations of litchfieldite and soda-syenites of Litchfield, Maine ; by 



R. A. Daly 403 



Separation of salt from saline water and mud ; by E. M. Kindle 471 



Subsidence of reef -encircled islands ; by W. M. Davis 480 



Ages of peneplains of the Appalachian province ; by E. W. Shaw 575 



Oolites in shale and their origin ; by W. A. Tarr 587 



Mesozoic history of Mexico, Central America, and the West Indies ; by 



T. W. Stanton 001 



Relations between the Mesozoic floras of North and South America ; by 



F. H. Knowlton 007 



Geologic history of Central America and the West Indies during Cenozoic 



time ; by T. W. Vaughan 015 



Paleogeographic significance of the Cenozoic floras of equatorial America 



and the adjacent regions ; by E. W. Berry 031 



Age of certain plant-bearing beds and associated marine formations in 



South America ; by E. W. Berry 037 



Bearing of the distribution of the existing flora of Central America and 



the Antilles on former land connections ; by William Trelease 040 



Affinities and origin of the Antillean mammals ; by W. M. Matthew 057 



Index 007 



