REMARKS 
ON THE 
COA EDI SVRTC? 
SOUTH LANCASHIRE. 
By JAMES HEYWOOD, F.RS., F.G.S. 
(Read December 29th, 1837.) 
Carponirerous rocks have long formed an ° 
interesting subject of mining investigation in the — 
county of Lancaster, and facts relating to the 
Geology of this district are continually disco- 
vered, by the researches of mining mdustry, 
and by the observations of local inquirers. 
Gritstone hills compose the Eastern boundary 
of the Lancashire coal district, separating the 
coal fields of Yorkshire and Lancashire from each 
other.* Gritstone strata also form the Northern 
boundary of the district, and on the North-East of 
Blackburn, in North Lancashire, steeply inclined 
beds of coal, termed “ rearing mines,” are found, 
* See the accompanying Map of the Coal District of South 
Lancashire. 
