3. CENTRE TOWNSHIP. F\ 203 



turns suddenly southward and cuts obliquely through the 

 various strata from the Lewistown limestone to the Hamilton 

 Upper shale, making one of the longest and most beautiful 

 passes in the county, and one of the habitats of the Deer's 

 Tongue laurel {Rhododendron maximum.) 



The zigzag form of Montebello narrows is probably a re- 

 sult of the exposure of some shale beds lying in the sand- 

 stone where the stream flowed, across the ridge as it rose. 

 After crossing the first belt of hard stone it worked its way 

 for some distance along the softer bed, and then meeting 

 some obstacle turned to the southward at a place where the 

 second belt of stone was low and gradually cut a way through 

 it. A similar tendency to excavate a valley in the middle 

 of the Hamilton sandstone may be seen in other places in 

 the county where the dip is not great, as for example at 

 Rattlesnake hill and Hentzel's narrows. 



The western end of Dick's hill is formed by a zigzag in 

 the stratum of sandstone which bends back upon itself to 

 the eastward and passes out of the township. Its further 

 course will be found in the account of Wheatfield and Car- 

 roll townships, where it may be traced on the geological 

 maps. 



Though it has not been possible to obtain a complete sec- 

 tion of the Hamilton sandstone in Centre township, yet the 

 following partial section indicates the relative position of 

 some of the fossiliferous beds : 



Top. Fine green sandstone, even bedded, containing numerous fossils, 

 especialh' Homalonatus Dekayi, Tropidoleptus carinatus. 

 Space concealed. 

 Very hard ferruginous sandstone, with Tropidoleptus carinatus. 



Space concealed. 

 Dark sandstone with abundant fossils. Tentaculites attenuates. 



Space concealed. 

 Soft yellowish sandstone with casts of Spiriferaformosa. 

 This is the fossil bed of the sandstone, and the bed that has yield- 

 ed in the south of the county, Rensselceria. 

 Space concealed. 

 Coarse sandstone with indistinct fossils. 

 Space conceale'l. 

 Base. Fine green sandstone with a large Murchisonia. 



