124 
JOHN PHILLIPS, F.R.S. 
learned from Mr. Francis Gill, of the Auld Gang Lead Mines, the 
succession of the strata in Swaledale, for comparison with the very 
different series I had before seen at Bristol, in the Forest of Dean, 
and near Pontypool." 
In 1821 Phillips passed through the limestone tract of Derbyshire, 
and over the summit ridge of millstone grit at Penistone into York- 
shire, and then spent four months in exploring the district round 
Halifax, Todmorden, Burnley, Skipton, and Settle. From Settle he 
went to Kirby Lonsdale, and attentively surveyed the line of the 
great Craven fault, and from Kirby Lonsdale into Westmoreland. 
Thence northwards he followed the basaltic line of the Roman wall, 
and skirting the Cheviot Hills, returned by Newcastle and Durham 
to Barnard Castle. Thence he travelled by Brignell Arkendale, 
Reeth, Leyburn, Masham, Ripon, Ripley, Harrogate and Harewood to 
Leeds, where he found Mr. E. S. George engaged in the details of local 
geology, and employing himself in making a manuscript geological 
map of the vicinity, It was during this tour in Northumberland 
that the observations were made, which were the groundwork of 
William Smith's geological map of the county. After again visiting 
Swaledale, his wanderings for this year closed at Nottingham. 
Early in 1822, Professor Phillips repeated his visit to many 
places already named, and after spending many months at Hesket 
Newmarket, he joined Mr. Smith at Kirby Lonsdale, from which 
delightful station a large region of slate, limestone, and millstone 
grit was minutely explored, and abundant fossils collected. 
In 1824 he walked from Kirby Lonsdale to York, chiefly following 
the valley of the Aire, "and it was in arranging the small collection 
then belonging to the Yorkshire Philosophical Society, and in drawing 
for Mr. Smith's lectures that I first resolved to follow out the recom- 
mendation of the Council of that Society, and to devote a considerable 
portion of my time to the illustrations of the geology of Yorkshire. 
My lamented friend, Mr. E. S. George, walked with me to Greenhow 
Hill and through a part of Wharfedale, one of the most instructive 
short journeys I ever made, and the first in which I used the mountain 
barometer, an instrument of inestimable value where exactness is 
desired in investigating a complicated series of rocks in a district 
like that of the Yorkshire dales." 
