530 HISTORICAL GEOLOGY. 



ton, in southwestern Massachusetts, into Canaan and Salisbui}- in north- 

 western Connecticut. 



The accompanying map (Fig. 733) ilkistrates the character and positions 

 of the belts of limestone (horizontally lined areasj, which extend southward 

 in eastern New York and from Canaan and Salisbury in Connecticut. The 

 area covered with V symbols is mainly Archaean. It is a continuation of 

 the New Jersey Highlands (a part of the protaxis) ; it crosses the Hudson, 

 between Peekskill and Fishkill, N.Y. West of the Kent Belt of lime- 

 stone there is an area of gneiss and other schists and some limestone of 

 Archaean age, between borders of Taconic schists and quartzyte. The cross- 

 lined area, west of the Hudson, is the Palisade belt of trap. 



At the northeast corner of the map, in Canaan (a tuwn lying mostly to 

 the north of the northern limit of the map), the southern part of the great 

 Stockbridge belt divides. The chief branch extends southwestward into 

 eastern New York, and then southward to Dykemans, where it ends against 

 the Archaean, after an interval of mica schist. Just loest of the Taconic 

 Ridge are other belts of limestone. The first of these is a western portion 

 of the limestone belt of Stockbridge and West Stockbridge ; for the limestone 

 east of the Taconic Ridge dips under the schist of the mountain, and comes 

 again to the surface, through a synclinal flexure ; the character of the syn- 

 cline is illustrated for the Mount Washington region, in Fig. 103, page 105. 



In further illustration of the synclines of the Taconic Range, Figs. 734, 

 735 are here introduced. Fig. 734 represents the general structure of Grey- 



734. 



Taconic synclinal mountains of crystalline limestone overlaid by mica or hydromica schist. Fig. 784, Greylock,. 

 Emmons. 735, Mount Eolug in Dorset, Vt. Hitchcoclc. 



lock, the Taconic Mountain of northwestern Massachusetts (the blocked 

 areas are limestone) ; and Fig. 735, Mount Eolus, Vt., a different phase of 

 the syncline, in which the mountain consists mainly of limestone. All the 

 western belts of limestone have similar relations to the schists. On the 

 map they are shown to extend southwestward, with one or two interruptions, 

 into and through Dutchess County, N.Y., and to and beyond the Hudson 

 River, as above stated. 



The other narrower branch, which begins in southern Canaan (just beyond 

 the north border of the map), as shown by Percival, extends southward, 

 and passes Kent. Farther eastward, there is still another outcrop of this 

 same limestone, owing to a syncline, in a belt that passes by New Milford. 

 Southward from the extremities of these two belts (see the map) a series 

 of smaller limestone belts is continued through Westchester County, N.Y.,, 



