Notes, Reviews and Comments. 125 



a long list of altitudes in metres and a series of five geological 

 maps prepared under the direiction of the late Antonio del 

 Castillo. (Government Report). 



Todd, J. E. — " Log-like Concretions and fossil shores." Amer. 

 Geol., Vol. XVII. No. 6. PI. XII, p. 347-349, June, 1896. 



The concretions in question belong to the Laramie formation 

 of Western Dakota. They are log-like in shape, composed of 

 fine sand cemented together with calcareous matter and showing 

 wavy lamination or ripple marks. One block was about twelve 

 feet in length and two feet in diameter. No fossils were found 

 in them. The hypothesis is that such concretions mark ancient 

 beaches. 



This interesting paper calls to mind certain log-like concre- 

 tions collected by Mr. N. J. Giroux in the Trenton (Ordovician) 

 of Eastern Ontario last summer and communicated to the 

 Director of the Geological Survey of Canada and to ourselves. 



Dodge, R. E. — " Geography from Nature." Bull. Am. Geog. 

 Society, XXVIII. eleven pages. 



An interesting appeal for the study of Geography in the 

 field, on excursions, where the various forces of Nature that are 

 at work can be readily observed in their great form-producmg 

 processes. We recommend this paper to all teachers and 

 students of geography. 



Taylor F. B. — " Notes on the Quaternary geology of the Mattawa 

 attd Ottawa Valleys!' Amer. Geol. Vol. XVII, No. 2, pp. 

 109-120, August, 1896. 



This paper is of special interest to all students of Pleistocnee 

 geology in North America and describes numerous points 

 observed by Mr. Taylor during his visit and study of the region 



