ABSTRACTS OF PAPEES 75 



located in the nearly level strata of the Swabian plateau. In its center the 

 beds have been raised nearly 500 feet above their normal level, vv^hile, sur- 

 rounding this central uplift, a ring-shaped area has been depressed by a similar 

 amount below the original level, being separated from the undisturbed strata 

 of the plateau by strong faults. With the possible exceptions of the near-by 

 Ries-basin, it has thus far been the only knovpn representative of this type of 

 structure, for which Branco and Fraas have proposed the term "cryptovol- 

 canie." 



A strictly analogous structure in Adams County, Ohio, measuring over four 

 miles in diameter, was mapped by the writer in the summer of 1919. 



It was discussed with the aid of the geological map and of diagrams and 

 photographs. 



Presented without manuscript. 



Discussed by Professors T. C. Chamberlin, G. H. Chadwick, and W. A. 

 Tarr. 



PROBABLE CAUSE OF THE LOCALIZATION OF THE MAJOR GE08TNCLINES 

 BY WALTER H. BUCHER 



iAl)stract) 



The existing theories which attempt to explain the narrow belts of intense 

 folding in contrast with the large unfolded elements of the earth's surface are 

 inadequate, because they all fail to account simultaneously and satisfactorily 

 for two most fundamental facts : the rising of the mountain folds out of pre- 

 existing geosynclines and the design formed by these labile belts on the earth's 

 surface. 



Haug's reconstruction of the geosynclines of post-Paleozoic time was dis- 

 cussed. Special emphasis was laid on the parallelism existing between these 

 geosynclines and those of Paleozoic time, and its bearing on those parts of his 

 reconstruction which at first glance seem purely hypothetical. 



The result of a series of simple experiments made by the writer were pre- 

 sented, in which this design has been duplicated in all its essentials through 

 the deformation of glass spheres in a manner which directly implies the possi- 

 bility of the formation of geosynclines along the prescribed lines on a sphere 

 of the earth's constitution. 



An interpretation of these results in the light of the deformation character- 

 istic of the geosynclinal belts was offered. 



Presented without manuscript. 



POSTGLACIAL FAULTING ABOUT MOUNT TOBY, MASSACHUSETTS^ 

 BY F. B. LOOMIS 



The subject of faults of postglacial age has received some notice in New 

 York and New England, small faults in the Champlain clays and l)reaks in 



^Manuscript received by the Secretary of the Society .Tanuary 13, 1021. 



