44 Rev. A. Sedgwick on the Geological Relations and 



of its course the boundary line cannot be laid down without a careful survey; as it forms a thin 

 capping on the inferior strata, and passes (without making any physical feature in the district) 

 considerably to the east, of an irregular plateau formed by the skirt of the Derbyshire coal-field*. 

 From the point above mentioned, half a mile west of Sutton, the limestone ranges to the north- 

 west and caps the hill north cf Ilucknall Huthwaite ; from thence it forms the summit of a hill 

 which rantres to the north-east, and it crosses the road from Skegby to Tibshelf, about half a mile 

 west of the former place. A little further to the north-east the boundary line crosses a valley of 

 denudation, passes south of Tevershall, and ranges in a north. westerly direction into Hardwick 

 Park, where it enters Derbyshire, and begins once more to form a lofty well-defined escarpmentf. 



The escarpment passes under Hardwick Hall to the east of Holt Hucknall, and then ranges 

 nearly in a straight line immediately on the west side of the villages of Glapwell, Palterton, 

 Bolsover, and Clown. About a mile north of the last-mentioned place, the line deflects to the 

 west, sweeps round the village Barlborough (which stands on the escarpment), then turns to the 

 north-east and passes a little south of the Hall, and then turns north towards Pibley Inn ; but 

 before reaching that place it deflects to the east and south-cast, and wheels round a denudation 

 near a place called Cinders. 



In the latter part of the course just described, the demarcation is not well defined ; but soon 

 afterwards on entering the county of York, it forms an obscure escarpment, and passes in a north- 

 easterly direction along the brow of the hill about a quarter of a mile to the south-east of Ilart- 

 Ilill. From thence, continuing the same range, the line of demarcation descends into a valley, 

 and crosses the canal at the Dog Kennel ; from which place it deflects along the brow of the hill 

 to the west; and above Penny Holme turns up into the south-eastern part of the Dark, from 

 ■which it descends to the village of South Anston. From thence it gradually descends to the east 

 along the brow of a hill, and crosses the rivulet about three-quarters of a mile below the village. 

 It then returns along the brow on the north side of the valley, and encloses the village of North 

 Anston \. 



From North Anston to the point where the river Air cuts through the whole formation (a 

 distance of more than thirty miles), the boundary is on the whole very correctly laid down in the 

 geological map of Yorkshire. Through this extensive range the limestone occupies the upper 

 part of a well-defined terrace, the bearing of which is nearly determined by the following places ; 

 viz. Dinnington, Laughton, IIooton-Lovett, Maltby, Micklebring, the hills to the east of Conis. 

 borough, Cadeby, Melton, Hickleton, Ilooton-Pagnell, North and South Elmsall, Upton Beacon, 

 and Wentbridge Hill ; all of which are on the edge of the escarpment. From AVentbridge to the 



* In this part of Smith's map the boundary line is erroneous. 1st, It extends too far, by about 

 two-thirds of a mile on the west side of Kirkby. 2ndly, The spur of limestone on the road from 

 Sutton to Alfreton is made to extend about a mile too far. 3rdly, The boundary line extends 

 about a mile too far west, on the road from Sutton to the coal-field, 



t Here also Smith's boundary line extends too far to the west. Stanley, Fackley, &;c. are, 

 if I mistake not, considerably to the west of the limestone. The demarcation is however obscure ; 

 and a variety of marlstone (which might perhaps be referred to the lower beds of the magnesian 

 limestone) is found near Fackley, and at some other places on the west side of the line above 

 given. This marlstone is vitrified by burning, and in that state is used for the repair of the 

 roads. 



+ Smith's representation of the magnesian limestone in the southern extremity of Yorkshire is 

 not accurate. 1st, The boundary line near Hart Hill is made to extend too far to the north-west. 

 2ndly, The limestone is extended from South Anston to Todwick, more than a mile too far to the 

 north-west. 3rdly, The two valleys of denudation, through which the waters of the canal and the 

 South Anston rivulet find a passage, are partly excavated in the limestone, and do not form an 

 outlier as delineated in the map. 



