46 Rev. A. Sedgwick on the Geological Relations and 



all the higher part of Walkingham Warren, and from thence extends along the top of the ridge 

 into the liberty of Brearton. Its western extremity is, however, entirely concealed under accu- 

 mulations of diluvium. From the plateau of the warren the line descends into a second valley 

 of denudation, which it crosses at a point which bears about south-east from Burton Leonard*, 

 For some miles beyond this point the range is well defined, and may be easily follow(;d through a 

 succession of quarries, which are opened in the escarpment to the south and west of Burton Leo- 

 nard, and, afterwards, through a low ridge which crosses the Ripon road, and for some way runs 

 near the north bank of the South Stainley rivulet. The prolonged line encloses Ingerthorpe, and 

 may be traced to a hiil about a quarter of a mile north-west of the village, beyond which place it 

 bears away to the north. 



In consequence of the enormous mounds of diluvium, which appear in some places to have 

 buried the regular strata to the depth of two or three hundred feet, some remaining parts of the 

 range to Ripon cannot be exactly ascertained. What is offered here can only be considered as 

 an approximation ; but, as far as regards this district, none of the published geological maps can 

 lay any claim even to this humble merit. From the hill north-west of Ingerthorp, the demarca- 

 tion ranges on the west of Markinfield Hall, appears to pass a little to the east of How Hill 

 (which is one great mass of diluvium), to the west of Morker Grange, and a little to the east of 

 Low Morker, near which place it passes down into the valley below Fountains Abbey, and from 

 thence through the southern part of Studley Park to Clipthorn near Oldfield. From this place, 

 for about two miles, no rock is visible, though the country is considerably elevated, and presents 

 an escarpment towards the west ; but in a quarry a little to the west of Linderick, the limestone 

 breaks out from beneath the diluvium. The demarcation afterwards sweeps round to the N. N.E. 

 (leaving Winksley considerably to the west), and crosses the next valley of denudation a little 

 above Bishopton on the east side of Rijion. Some of the places mentioned above may perhaps 

 belong to outliers of the limestone ; for it is obviously impossible, in the present state of the 

 country, to make out the entire continuity of the formation. 



From the valley to the north-east of Ripon, the limestone, without making any great feature 

 in the country, rises along the higher part of a ridge, and the demarcation passes to the west of 

 Sutton Grange .and Sutton, near Musterfield, and from thence to the top of a hill considerably to 

 the west of Sleningford Hall. The ridge then descends in an irregular line towards the north, 

 and the magnesian limestone crosses the Ure nearly half a mile below Tanfield. The formation 

 then rises on the north side of the village to a commanding elevation, and ranges nearly in a 

 straight line along the top of a lofty ridge through Gebdykes and Halfpenny-house, to a hili 

 about two-thirds of a mile west of Watlas, whore the escarpment abruptly terminates. 



From Watlas to Little Crakehall there is no trace of the magnesian limestone : the whole of it 

 is perhaps swept away ; or a part of it may be buried under the heaps of diluvial gravel which 

 are spread over all the neighbouring district. But the formation is laid bare in the bed of the 

 rivulet between Brompton Patrick and Little Crakehall, and is continued in the same situation 

 to a point below the latter village. 



Again, for nearly five miles all traces of the formation are lost; but, on the private road from 

 Bedale to Catterick (about a mile from the latter place), it breaks out from beneath a great 

 mound of diluvial gravel, and is probably the base of a part of the ridge which extends towards 



* The spur of limestone between the two valleys of denudation is not sufficiently extended by 

 Mr. Smith to the south-west. It is also represented as an outlier ; an error into which he has 

 been led by the very inaccurate manner in which the courses of the neighbouring rivulets have 

 been delineated in the map of Yorkshire. 



