WITH THE YORKSHIRE COAL-FIELD. 
117 
Meanwhile the work in connection with the great line of sections 
joining the Lancashire and Yorkshire Coal-fields was in active progress 
and the annual report of the council presented 27th September, 
1843, states " That two of the sections are now completed, namely, 
that surveyed by Mr. Bull, wdiich includes the township of Mirfield ; 
and the one by Mr. T. W. Hall, comprising the townships of Bretton- 
West, Crigglestone, Wortley, Notton, Roystone, Shafton, Brierley, 
and Great Houghton ; extending over a distance of 9 miles and 
exhibiting a noble instance of individual exertion to the advancement 
of scientific knowledge." The remaining contributors to the section 
are urged to proceed as rapidly as may be consistent with correct work. 
At the next meeting of the society at Huddersfield, in December, 
1843, Mr. Henry Briggs exhibited and explained the portion of the 
line of section he had undertaken, comprehending the township of 
Thornhill and the hamlet of Netherton. The portion of the section 
extending through the tow^nships of Clifton and Hartshead had also 
been completed by Mr. Henry Holt, and was exhibited at the same 
meeting. The portion of the section undertaken by the Rev. "W. 
Thorp, viz., Clayton and South Elmsall, and that of Messrs. Morton 
and Embleton were already completed, and the whole series, together 
with numerous sections of pits and borings, were available for refer- 
ence by members of the Society. 
The Rev. W. Thorp had prepared an independent series of sec- 
tions for the illustration of his work on the West Riding Coal-field, a 
notice of which will be found on another page. The sections were 
printed and sold, and until the more elaborate and complete ones, 
issued by the Geological Survey, were available, Mr. Thorp's sections 
were greatly prized. 
In 1852 the quarter sheets of the Geological Survey 81 N.E. and 
82 N.W., bordering on the county of Derbyshire, were coloured geo- 
logically, the first by Professor John Phillips, and the latter by Pro- 
fessor Phillips and Warrington W. Smyth. Other quarter sheets 
bordering on the Lancashire districts were coloured by Mr. W. T. 
Aveline and Professor Edward Hull in 1863 ; but it was not until 
1866-7 that the Geological Survey of the Yorkshire Coal-field was 
systematically commenced. The survey of the West Riding Coal- 
