;>u 



RELATIONS OF THE TACONlt 



Whitehall mountain, bo thai .ill doubt in regard t<> n> position and relation is removed by 

 direct inspection. 

 The diagram in Fig. 2 illustrates the position and relations exhibited ai Whitehall. 



li^. B. 



'■ 



a, a ntain, which is surmounted bj il adrock; 6,4. Tertian. 



c c i : d, d. Calcifei tie, unconformable to the Taeonic slate, and dipping 



pos lion, ii" one can doubl the wide difference in age between this slate and 

 those of tin' Hudson river; the former being below the oldest members of the New York 

 system, while the lattei rest conformably upon the middle members of the Champlain 

 division. The Taconi< or black slate, the newest member of the Taeonic series, u.-i>not 

 only deposited anterior to the oilier under consideration, but was disturbed or removed 

 from the horizontal position; and its deposition and disturbance seem to mark the close i I 

 one _■ ological period of great duration, if we maj judge from tin- united thickness of the 

 rocks belonging to it. 



thei section (Fig.3), differing lmt little in detail from the preceding, bul exhibiting 

 more fully the relations of these systems, is annexed. 



n e . 3. 



*S**s 



i church three mi deep ravine in which the Taeonic slate, d , d, is denuded ; 



a, a. Calciferous saru!- 



Anotlier section (Fig. 4), passing through the slates and shales of r lie Hudson river as 

 well as the Taeonic slat ;en from the hills of Greenbush opposite the city of Albany. 



ne- i. 



- 



■ - -■» 



a. Tertiary clay ; b. Hudson rin I'alciferous sandstone. 



i m the ferry, the first rocks are the shales of Hudson river, overlaid by tertiary 



the Red mill. Leaving the mill, the rocks are concealed till we reach 

 .inmit of a low range of lulls bordering the eastern side of the valley of the Hudson. 



