THE EAST SWALE DISTRICT. 21^ 



miles, opposite Northallerton it is margined on the east by 

 the woods of Cotcliffe, which extend for about two miles along 

 the slope of a bank of the liassic shale, the summit of which is 

 about 400 feet in height above the stream, and at the south 

 end of this bank the sandstone of the Lower Oolite just shews 

 itself. A considerable slip of land has taken place here, a part of 

 the wood having glided down so gradually that the trees and 

 brushwood which compose it are not destroyed : and over the 

 site of what a quarter of a century ago was a grassy meadow 

 by the side of the stream, there is now a steep, broken, wood- 

 covered, clayey bank. We have here an instance, upon a 

 small scale, of the same kind of land-slip that has occurred at 

 Kirkby Knowle upon a much larger scale within the memory of 

 man, and upon a much larger scale still at Gormire, at a period 

 which is perhaps as far back as the great glacial inundation. 

 At Brawith, Codbeck is increased by the stream which rises 

 near Kepwick, and soon afterwards it is joined by a rivulet from 

 Kirkby Knowle and Mount Saint John. The town of Thirsk is 

 situated upon the banks of Codbeck, upon the eastern edge of 

 the Central Valley and at a distance of five miles due west of 

 Whitestone Cliff. Upon the east of the town the liassic slope 

 attains 200 feet within a mile of it, and this altitude of surface 

 is almost or quite maintained till the foot of the hill-bank is 

 reached. The Boltby stream flows in a south-western direction 

 past Sutton-under-Whitestone Cliff and Bagby, and falls into Cod- 

 beck near Gristhwaite, and soon afterwards the latter pours its 

 waters into the Swale. The following are the more interesting 

 plants of the low country in the neighbourhood of Thirsk : 



Afyosurus miniinus 

 Ranunculus Jloribundns 



„ Jluitans 

 Ranunculus hirsutus 

 Fumaria pallidijlora 

 Alyssum calycinum 

 Turritis glabra 

 Nasturtium sylvestre 

 Sinapis tenuifolia 



Jan. 1889. 



Viola peregrina 

 Saponaria ojjlcinalis 

 Silene anglica 

 Cerastitim aqjiaticuin 

 Stellaria brachypetala 

 Radiola Millcgrana 

 Geraimiin pyrenaicum 

 Rubus plicatus 

 „ thyrsoideus 



