CLINTON GROUP. 



n 



oolitic than tliat below, and with fewer concretions, and usually has less carbonate of lime intermixed. It 

 l^appears at WoleoU furnace, and is apparently the bed wrought six miles further east. 

 5.^ limestone similar to the more calcareous portions of No. 3; and, at Rochester, containing few fossils 

 except erinoidal joints : it is usually thinbedded, the layers separated by shale. It contains numerous 

 cavities filled or partially filled with sulphate of lime, sulphate of baryta, iron pyrites, etc. From its si- 

 tuation as the separating mass, it partakes also of the character of the next succeeding group. The Niagara, 

 however, being so well characterized, and the Clinton group an acknowledged variable one, it is thought 

 better to place it with the latter. 



The same essential order in the parts of the group appertains to it in several localities in 

 Waj'ne county, but west of the Gene.see river two or more of its members are wanting. The 

 shale and calcareous matter seem equally persistent, but both gradually diminish westward. 



Section ori the Genesee rioer,from the upper to the lower fall at Rochester. 



1, 2, 3. Upper, Middle, and Lower falls. 

 g. Shale of Niagara group. 

 /. Upper limestone of Clinton group. ") 

 e. Upper green shale. I 



d. Pentarnerus limestone. ^ Clinton group. 



r. Lower green shale. i 



b. Grey band, upper part of Medina sandstone. 

 a. Medina sandstone. 



1. Section of the strata one mile south of Medina. 



2. Section showing the Clinton group and associated 

 strata at Leiviston, on the JViagara river. 



g. Niagara shale. 



/. Upper limestone of Clinton group. 



e. Place of the upper green shale : no rock seen. 



d. Pentamerus or lower limestone of Clinton group. 



c. Lower green shale of Clinton group. 



b. Terminal gray mass of the Medina sandstone. 



a. Medina sandstone. 



e. Niagara shale. 



d. Limestone, formed by the junction of the lower and 



upper limestones of the group. 

 c. Lower green shale of Clinton group. 

 b. Terminating gray portion of the Medina sandstone. 

 a. Medina sandstone. 



»*# The three last preceding sections are taken from the Report for 1843, pp. 69, 78 & 79. 



[ PAI,.ffi0NT0L00Y — VoL. II.] 



