ABOUT MANCHESTER. 151 



3. Another Sand- Rocky at same place, hut^d 

 yards below the surface, and below the 

 uppermost Bed of Coal, 



The specific gravity of tliis is 2.6 ; it is closer 

 grained, and does not imbibe water readily. It 

 is more remarkably streaked than the upper rock ; 

 it effervesces a Httle with muriatic acid, and yields 

 some iron oxide. In chemical constitution, it 

 agrees nearly with the bottom rock at Collyhurst. 



4. Red Sand-Rock, 



This kind of rock, I believe, abounds in this 

 district. I shall not attempt to decide whether 

 the samples I have examined are from what 

 geologists call old or new red sand-stone, but 

 merely state where they were obtained, and what 

 characters they possess. 



The specimens were from, 



1. Red Rock, opposite the New Bay ley. 



2. Red Sand-Rock, from the Tunnel, Garrett. 



3. Red Sand-Rock, Tinker's Garden. 



4. Bank Bridge Rock. 



5. Holt Town Rock. 



6. Sand-Rock, near Agecroft Bridge. 



7. Red Sand, in a granular state, from various 

 other places. 



