DESCRIPTION OF PLATES. 437 



Fig. 2. Section from Alexandria to Rodman. The direction is nearly southeast, passing throun-h 

 Orleans and Brownville. It commences on the primary, and terminates in the same rocks as the pre- 

 ceding-. 



Fig. 3. Section extending southeast four miles from Watertown. It embraces only the Birdseye, 

 Isle la Motte marble, and Trenton limestone. Dip S.W. 



Fig. 4. Section from French creek to Depauville. Direction nearly east and west ; distance ten 

 miles. Rocks dip only slightly southwest ; tmdisturbed, but have been remarkably waterwom. Section 

 crosses the e^xcavations. 



PLATE XI. 



Sections explanatory of the Taconic si/stem. 



The sections of this plate run east and west, and pass over about fifteen miles, except Fig. 5, which 

 extends only seven miles. The relative position of all the masses has not been made out, particularly 

 the Taconic slate and those of the Hudson river, and then again the position of the granular quartz and 

 the Stockbridge limestone ; at some points, the former appears embraced in the latter. The limestones 

 occupy uniformly the valleys as represented in all the sections, which are produced by the joint opera- 

 tion of uplifts and diluvial action. In Fig. 5, there are numerous uplifts in the shales east of Lake 

 Champlain ; the same mass appears at several points in the direction of the section. The coloring is the 

 same as upon the other sections : the primary, lake; the limestones, blue ; the quartz, brown; the slates, 

 black or dark ; and those of the Champlain group, purple. The distinctions of color in the Taconic 

 system are only faintly marked. 



PLATE XII. 



Sections of Clinton county. 



Fig. 1. Section extending from Plattsburgh to Redford, twenty-two miles. Dip of the rock east, but 

 concealed by drift towards Redford. 



Fig. 2, is a section of half a mile, near Chazy village. It is intended to show the large development 

 of the Calciferous sandrock, and the relation of the masses which compose the rock. 



Fig. 3, shows the relation of the rocks extending from Chazy village to the landing. 



Fig. 4. This section extends over the Hudson river shales and sandstones on the eastern shore of the 

 lake, nearly opposite Chazy. 



PLATES XIII., XIV., XV., 

 Are pictorial views in the interior of Hamilton county : they were taken by Mr. Hill. 

 The reduced maps of Jefferson and Clinton are intended to exhibit the relation of the rocks composing 

 the Champlain group. Their coloring corresponds in the main with the large map accompanying the 

 Geological Reports. 



Geol. 2d Dist. 57 



