802 THE JOURNAL OF GEOLOGY. 



pitch, to be reliable, must be based on observations made over a 



considerable area. Wm. H. Hobbs. 



University of Wisconsin, 

 Madison, Wis. 



EXPLANATION OF PLATES. 



Plate V. — Geological Map of portions of Sheffield, Mass., and Salisbury, Conn., 

 based on the Sheffield and Cornwall sheets of the Topographical Map of the United 

 States by the U. S. Geological Survey. Scale 1 : 62,500. 



Plate VI. — Series of Geological Sections to accompany Plate V. Their location 

 is indicated on the map (Plate V.) Horizontal Scale : one inch equals one mile. 

 Vertical Scale : one-eighth inch equals five hundred feet. 



Plate VII. — Fig. i. View showing the southern termination of one of the longi- 

 tudinal undulations of the western schist anticlinal, as seen from the west. A, South- 

 ern limit of a ridge of Riga Schist (No. 10). B, Turnip Rock (Everett Schist). C, 

 Barack M'Teth (Everett Schist). D, Knoll of Riga Schist. E, Tom's Hill in the 

 distance. F, Ridge No. 6 (Riga Schist). The dotted and dashed line shows the 

 approximate boundary between the Riga Schist and the Egremont Limestone, and the 

 dotted line the approximate boundary between the Egremont Limestone and the 

 Everett Schist. 



Fig. 2. View of schist ridges separated by belts of limestone at the southeast base 

 of Tom's Hill near the railroad bridge. A, B, C, Schist ridges. D, Slope of Tom's 

 Hill where a fourth schist belt is hidden in the trees. 



Fig. 3. Canaan Dolomite occupying the core of an anticlinal of Riga Schist at 

 the south end of area No. 6. The view looks southeast. A, Outcrop of Riga Schist. 

 B, Canaan Dolomite. C, Riga Schist. 



