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XVI. — Notes to accompany a Geological Map of the Forest of Dean 



Coal-Jield. 



By henry MACLAUCHLAN, Esq., F.G.S. 

 Employed on the Ordnance Trigonometrical Survey. 



[Read February 6, 1833.] 



The following notes were collected during the progress of the Ordnance 

 Survey in 1830, but some additions were made at a subsequent visit to the 

 Forest of Dean. It is desirable that I should acknowledge the several au- 

 thorities from whom information has been obtained. 



From occasional intercourse with the Rev. W. D. Conybeare, I derived 

 the little knowledge which gave rise to these notes. 



The memoir by Professor Buckland and the Rev. W. D. Conybeare, on 

 the south-western coal district of England ; as well as that by T. Weaver, 

 Esq., on part of Gloucestershire ; and the section of the Forest of Dean by 

 D. Mushet, Esq.*, have served as foundations to the mapf and the notes. 



Charles Bathurst, Esq., of Lydney Park, supplied the minute observations 

 respecting that neighbourhood, particularly those relating to the fault between 

 Lydney and Denbigh Lodge. 



D. Mushet, Esq. and Mr. Henry James, of the Forest of Dean and Lydney, 

 greatly assisted me, not only in marking the outcrop of the beds of coal, but in 

 pointing out where the best information could be obtained. 



Mr. Moses Teague, of Parkend, supplied the outcrop of the two upper beds 

 of coal from actual observation ; and the accuracy of the northern curve of 

 the same beds was confirmed by Mr. James Bennett, of Drybrook, who has 

 extensive works on the spot. 



From information supplied by Aaron Hale, of Coleford Meend, have been 

 laid down the fault from Worcester Lodge to Bury Hill, and the probable 

 range of the Coleford high delf coal, between Bic Slade and Carter's- 

 piece Meend;|;. 



The author's colleagues on the Ordnance Survey, have from time to time 



* Geological Transactions, vol. 1. of the Second Series, pp. 280, 288, 352, also Plate S2, 38, 

 and 39. t Plate XV. 



J It is suggested that this range should be received with caution, notwithstanding it has been 

 partly confirmed by Mr. Mushet ; as it is difficult for a beginner to comprehend perfectly the 

 remarks of a practical miner. 



2 c 2 



