82 PROCEEDIXGS OF THE AXX ARBOR MEETING 



and the writer, in wliicli such spheres were subjected to hydrostatic pressure, 

 lu the first series of experiments, thin- walled, hollow glass spheres were thus 

 fractured under compression. In the second series, spheres were used which 

 more nearly correspond to the conditions involved in the deformation of the 

 earth's crust. 



Finally, an attempt is made to use these experiments as the foundation for 

 a consistent theory of major diastrophism. 



Eead from notes. 



Discussiox 



Prof. W. H. HoBBS : Any one who has read Professor Bucher's classical 

 study of ripple-marks will attach importance to any other investigations which 

 he makes. I was one of those who offered objection to the claimed applica- 

 bility of his experiments on frost-expanded glass balls to the problems of 

 coastal deformation. I must offer objection now to the later series of experi- 

 ments here presented, on the ground that they do not simulate in any close 

 way the probable stress systems involved in coastal deformation. 



Brief remarks were also made by Mr. F. P. Sliepard. with reply by the 

 author. 



SOME STRUCTURAL FEATURES OF THE PLAIXS AREA OF ALBERTA CAUSED 



BY PLEISTOCESE GLACIATIOX 



BY OLIVER B. HOPKIXS 



Read in abstract from manuscript. 



Brief remarks were made by Messrs. Hobbs and Hill. 



CORRESPOyDEXCE BETWEEN THE GOXDWAXA SYSTEM OF HIXDUSTAX AXD 

 THE XE^VARK SYSTEM OF THE EASTERX EXITED STATES 



BY WILLIAM H. HOBBS 



i Abstract) 



The Gondwana system of Hindustan presents striking parallels with the 

 Newark system of the eastern United States. These correspondences are espe- 

 cially : (1) the coarse, often red. and sometimes markedly feldspathic ma- 

 terials derived from the Precambrian : (2) the unity of the sedimentary series 

 and its slightly tilted attitude: (3) the occurrence as isolated erosional rem- 

 nants preserved by inset within crystalline rocks and bounded by faults; (4) 

 the elaborate system of intersecting near-vertical faults and the abundance of 

 basic flows and dikes: (5) intercalated coal seams and ganoid fishes as char- 

 acteristic fossils: (6) the nature of the differences which characterize the 

 several areas of each system among themselves. 



The American Newark has been regarded as probably of Jura-Trias age. 

 based upon the fossils found in the northern areas. The Gondwana system 

 has been definitely shown to have areas of lower, middle, and upper Gondwana 

 age, and these range from the Pennsylvanian to the Jurassic. In most physical 

 aspects the lower Gondwana closely resembles the southern Newark areas, as 



