830 REVIEWS 



beds have been noted, and illustrated by a number of diagrams. The 

 rocks of the area are confined to the Pennsylvanian, with comparatively 

 simple structure. No. 6 is the only coal bed producing important 

 quantities of coal. 



A. D. B. 



Notes on Geology of the Gulf of St. Lawrence. By J. M. Clark. 

 New York State Museum, Bull. No. 158, pp. 11 1-20. 



The author treats briefly of the geology of Entry Island. Of chief 

 interest is his description of a type of topography which he calls "dem- 

 oiselle." The relief is due to numerous mammiform hills rounded 

 into softly contoured domes of striking symmetry. These domes are 

 caused by the erosion of small laccoliths. 



W. B. W. 



