204 Mr. Maclauchlan's Notes to accompany a Geological Map 



measures appear to rest upon the transition series, but at Kilcot Green, or 

 rather to the west of it, on the old red sandstone. 



The eastern side is overlaid irregularly by a conglomerate of the new red 

 system, formed principally of siliceous pebbles ; and it occasionally assumes 

 the appearance of a bed of gravel ; but in no case does it resemble the mag- 

 nesian limestone. Over this bed are other similar conglomerates which alter- 

 nate with strata of sandstone, dipping at a low angle (5") to the eastward. 



The western side of the field is composed of a fine-grained sandstone, with small quartzose par- 

 ticles occasionally disseminated through it ; thfi stone is generally iron shot, and sometimes thinly 

 laminated, and contains specks of coally matter. 



At Hill House, previous to working the coal, a boring was made to the depth of fifty yards, and 

 the following beds were passed through, according to information received from one of the work- 

 men employed in the undertaking. 



Red clay 30 yards (new red sandstone). 



Sand rock 4 feet. 



Clod or clay 8 feet. 



Coal 7 feet. 



Clod 4 feet. 



Coal 2 feet 6 inches. 



Clod 15 feet. 



Coal 4 feet. 



The rest of the boring was through clod or clay. 



The seven-feet coal was the bed principally worked ; but it was much disturbed, and dipped 

 rapidly, or two feet in a yard, to the north-east or east. 



In 300 yards, four faults of considerable magnitude were encountered, and the coal contained a 

 large quantity of sulphur. These circumstances, with the canal bringing the Staffordshire coal 

 so close to the field, may have caused the relinquishing of the work. 



Several other attempts have been made at Bowlsdon Farm, about a mile to the south-west of 

 Newent; where the coal is apparently near the surface ; and, as it is said to be seven feet thick, 

 it is probably the same bed as that which was worked at Hill House. The fuel, however, is better, 

 and less charged with sulphur than at that point. No engine was used, but numerous pits were 

 dug, from which it may be inferred, that unskilful means were employed to extract the coal. No 

 attempt has been made for several years. 



It is possible that the nearness of this coal-field to the anticlinal line, ranging from the valley of 

 Woolhope by May Hill to the Severn, may be the cause of the disturbances found in the strata; 

 for the measures are so far advanced to the westward, at Clifford's Mine, as to rest upon the trans- 

 ition beds. 



The Fault between Lydney Park and Denbigh Lodge, Forest of Dean*. 



It has been correctly statedf that along a certain portion of the edge of 

 the Forest coal-field, the limestone is cut off by a fault. This fault extends 



* See Map, PI. XV. f Geol Trans. 2d Series, vol. i. p. 286. 



