EX THE JKEY. DH. HOOPPELL. 



149 



LIMESTONE. 



KINDS. LOCALITIES. 



Compact Magnesian. The Trow Eocks, near South Shields. 

 Subcrystalline Mag- ,, ,, 



nesian. 

 Flaggy Magnesian. Quarry near Westoe, now filled in, and 



at Marsden. 

 Laminated Magnesian. ,, ,, 



Eed. 



Coarse Yellowish 



White. 

 "WHte. 



Flaggy. 

 Micaceous. 



SANDSTONE. 



The Deans, near South Shields. 

 Billy Mill, near N"orth Shields. 



Billy Mill, and Quarry near Lawe, long 

 since filled in, and Quarry near St. Mark's 

 Church, South Shields, now filled in. 



MILLSTONE GRIT. 



The Millstones found were composed of a very coarse grained 

 brownish grit, the nearest localities for which at the present day 

 .are in Weardale and N'orth JNorthumberland. 



RIVERINE PEBBLES, CLAY, SAND, ETC. 



Pebbles of Sandstone, These, according to the testimony of the 

 Carboniferous Lime- Pilots who live at the Lawe, were, with- 

 stone, Porphyry, Ba- out question, from the Mussel Scarp, a 



salt, etc. 



Clay. 



bank at the mouth of the Eiver, which was 

 finally removed by dredging a few years 

 ago. 



Clay for Tiles and Bricks exists in abun- 

 dance on the Lawe itself and its slopes, 

 particularly to the southward and west- 

 ward. But the Eomans seem to have used 

 bricks but sparingly in their buildings at 

 the Lawe. 



