790 THE JOURNAL OF GEOLOGY. 



are corrugated by a tertiary system of small flexures, and exami- 

 nation of the plications at localities usually reveals even a quar- 

 ternary system of minor foldings. Many of the small knolls 

 near Salisbury present a surface something like the half of a 

 muskmelon, except that a section, instead of resembling an epicy- 

 cloid, would be more like a sine curve developed on an arc (cf. 

 Fig. 2 (C). Figure 2 (D) illustrates this structure as seen in 

 the anticlinal ridge No. 6 south of Twin Lakes Station, and in a 

 number of small hills near Salisbury. 



The Everett Schist occurs in caps or mantles which are for 

 the most part shallow, nearly symmetrical, synclinals, as exhibited 



Fig. 3. View of Tom's Hill from the northwest, showing the serrated contour 

 caused by the alternation of belts of schist and limestone. A, Tom's Hill. B, North- 

 east foot of Miles Hill. C, Canaan Mt. D, Babe's Hill. 



in Turnip Rock (9), the cap on the southwest slope of Peck's 

 Hill (27), and the Washining Lake Mantle (5), the latter being 

 a double synclinal, as shown by the anticlinal ridge which forms 

 the island in the lake. 



Structure of Tom's Hill. — The doubled-peaked elevation east 

 of Washining Lake is a compound anticlinal of Riga Schist, 

 with two prominent crests appearing in Tom's Hill and Miles 

 Hill respectively. These anticlinals, like most others in this 

 region, are pushed over to the westward. A number of subordi- 

 nate anticlinals, likewise compressed and overturned and here 

 probably ruptured, are indicated on the map along the northern 

 boundary of the Riga Schist by fingers of schist which protrude 



