THE HOUSATONIC VALLEY. 79 1 



into the limestone, as well as by the serrated contour of the ridge 

 when seen from the northwest (cf. Fig. 3). Between Tom's 

 Hill and Miles Hill is a fold of Egremont Limestone over- 

 turned to the west and enclosing a core of the.Everett Schist. 

 The islands of limestone inclosed in the schist of the eastern 

 flank of Miles Hill, are the result of frequent alternations of 

 pitch in small reversed folds which for a short distance have 

 been ruptured. A stereogram showing the surface of the schist 

 before it had been cut away by erosion would here present the 

 characters of 'a choppy sea (cf. Fig. 2 E.) These long alter- 

 nating belts of schist and limestone on the southeast foot of the 

 hill northwest of the railroad bridge (Von map), are indicated 

 topographically by a series of low, sharp ridges which have 

 gradual east and steep west slopes (cf. Plate VII., Fig. 2). 

 Farther south, near the railroad bridge, the several schist ridges 

 become fused together and show more symmetrical undulations. 

 The dips are here uniformly east at angles varying from 30° to 

 50 , and the closeness with which the belts are crowded together 

 allows insufficient room for the full thickness of the Egremont 

 limestone of this vicinity. The indications therefore are that the 

 folds have here been so sharply compressed that the beds have 

 found relief in a slight dislocation or thrust, producing a struct- 

 ure best illustrated in Fig. 2 (B), to which Suess has applied 

 the term Sdmppenstruktur, 1 - and which I would term weather- 

 board structure. It is probable that both the throw and dis- 

 placement of these dislocations is very slight, being greatest 

 where the crest-lines show an anticlinal structure and least where 

 they show a synclinal structure. An attempt has been made to 

 show the nature of these dislocations as they are supposed to 

 occur on the southeast flank of Miles Hill (Fig. 2 E.) Owing 

 to the covering of earth in the valleys, the course of the fault is 

 not exposed. The only locality where the beginnings of such a 



i Eduard Suess : Das Antlitz der Erde, Vol. I., p. 149. 



Gosselet has used struchire ecailleuse (Ann. soc. geol. du Nord, Vol. XII., 1885, p. 

 197) for similar structures, and Margerie recommends structure imbriquee (Margerie 

 et Heim, Les dislocations de l'ecorce terrestre, Zurich, 1888, p. 82). 



