156 
WILLIAM SMITH : HIS MAPS AND MEMOIRS 
It is full of admirably worked out details. In the West Eiding, the 
outcrops of the chief of the grit beds are represented on the map with 
their relations to the coal-seams, and a fine vertical section of them 
is given ; and in the north-east of the county, Smith clearly defines 
the estuarine strata of the Lower Oolites as follows : ' Sand Rock 
and Grit Freestone of the Moors, lying over the Alum Shale ' (Upper 
Lias), ' and, in Scarborough Castle Hill,' under the Oolite or Calcareous 
Freestone. A thin coal in the cliffs is worked on the moors at Danby 
and other places.' In this work we see the fruits of Smith's residence 
at Scarborough, which commenced in the year 1820." 
My copy of this map was formerly the property of Henry Holt, 
whose name is printed on the map case. It is in four separate sheets, 
each measuring 18J inches by 22J inches. They are so arranged that 
they can be pasted together as one map. 
On the top left-hand sheet are the words " Geological Map of," 
and on the top right-hand sheet " Yorkshire. By W. Smith, Mineral 
Surveyor." 
In the former, the country west of Stokesley, Hawnby, Coxwold, 
Easingwold and Moor Monckton, and north of Plumpton, Rilston 
and Long Preston, is included. The " Whinstone Dyke," which is 
shown on the adjoining map as commencing near the Peak Alum Works, 
is here traced through Stainton to Coatham Stob, north-west of Yarm. 
Outside the county boundary tablets of colour are shown as an index 
to the colours on the map. These are : — 
28. Brown-Red Sand Rock. 
31. Mountain or Metalliferous Limestone beneath the Coal 
Measures alternating loith Gritstone and Shale called Plate, 
the breaks in which contain the rich Veins of Lead and Cala- 
mine, extensively worked in the Mining Districts of Swaledale, 
Wensley Dale, &c. 
Millstone Grit. A thin bed of Coal over the Millstone Grit, 
worked at Tanhill, Leyburn, Wilton Fell, etc. 
Blue Rag, uppermost of the series of Slate Rocks in Westmore- 
land. 
30 m. Shale, thin Coal and Ironstone. 
n. Flagstones, Penhill and Summersides with other Rock, a Coal 
beneath. 
