276 CLEVELAND. 2^ 



of breadth. Excluding the CULTIVATED 

 DALES, &c. they may contain from three to 

 four hundred fquare miles, or from two to- 

 three hundred thoufand acres, of UNCULTI- 

 VATED HEATH. 



The MATERIALS of thefc mountains are 

 principally free-ftone, (of a fingularly fine 

 grain) which too frequently riles to the fur- 

 face ; lying in fome places above-ground in 

 blocks ; fome of them of confiderable fize. 

 A thin feam of coal has been found, and ftill 

 continues to be found, in different parts of 

 thefe hills, at no great depth from the fur- 

 face. Iron is forged near Ayton ; and csp- 

 per has been fmelted near Hacknefs. But 

 allum fhals is the moft valuable material of 

 the eaftern Morelands which alone, I be- 

 lieve, furniili the Ifland, and a great part of 

 Europe, with allum. 



The immediate SUBSOIL is generally fand; 

 which, in fome places ) is formed into a pan or 

 cruft i refembling rufty half-decayed iron 

 rather than an earthy fubftance : being al- 

 moft as impervious by water as an iron vef- 

 fel. 



The 



