REVIEWS 667 



study of the whole region and finds abundant evidence which renders 

 any other hypothesis untenable. The question as to what has become 

 of the projectile still remains unsettled. There are three possibilities: 

 (1) that it was broken into many small pieces and thrown out of the 

 crater; (2) that it has disappeared within the crater through oxidation 

 or some other cause; (3) that it is still somewhere in some form in the 

 depths of the crater. The author concludes that the last is the true 

 explanation and that the remains of the meteorite may yet be found. 



E. R. L. 



Age and Relations of the Little Falls Dolomite (Calciferous) of the 

 Mohawk Valley. By E. O. Ulrich and H. P. Cushing. 

 [N.Y. State Museum Bulletin 140, Sixth Report of the Director 

 1909, pp. 97-140.] 

 To clear up some uncertainty as to the exact stratigraphic relation- 

 ships of the Little Falls Dolomite, a series of sections in the Mohawk 

 Valley were studied by the authors and described and correlated in detail. 

 The formation was found to be in conformable sequence with the Theresa 

 formation and the Potsdam sandstone below and separated by an uncon- 

 formity from Beekmantown beds above. The paper concludes with a 

 strong argument for the adoption of the proposed Ozarkian system of 

 which the Little Falls Dolomite is a member. 



E. R. L. 



Report of the Vermont State Geologist, iqoq-iqio. By G. H. Per- 

 kins and Others. Pp. 361; Plates 71, Figs. 31. 



The report contains the following papers: "History and Condition 

 of the State Cabinet," by G. H. Perkins, pp. 1-75; "The Granites of 

 Vermont," by T. N. Dale, pp. 77-197; "The Surficial Geology of the 

 Champlain Basin," by C. H. Hitchcock, pp. 199-212; "Trilobites of 

 the Chazy of the Champlain Valley," by P. E. Raymond, pp. 213-28; 

 "Geology of the Burlington Quadrangle," by G. H. Perkins, pp. 249- 

 56; "Preliminary Report on the Geology of Addison County," by H. M. 

 Seely, pp. 257-313; "Asbestos in Vermont," by C. H. Richardson, pp. 

 315-30; "Mineral Resources," by G. H. Perkins, pp. 331-52. 



Eight plates illustrate the trilobites of the Chazy and ten the fauna 



of the Fort Cassin beds (Beekmantown) which are found in Addison 



County. 



E. R. L. 



