140 



which had been figured in the Transactions of the Manchester 

 Society, was shown to the members. 



Mr. Mc.MuRTKiE here submitted to the Club a series of 

 diagrams and sections, illustrative of the Somerset and Glou- 

 cestershii-e districts. The chief features pointed out were : — 



1st. — The fact that the Mendip range had originally been 

 upheaved by a protrusion of " trap," discovered within the last 

 few years by Mr. Charles Mooke. 



2nd. — That this upheaval had, over a district of country four 

 miles in length, folded the coal-measures back upon themselves, 

 causing them to dip southwards towards the range, instead of 

 northwards, mid from it. 



3rd. — That a mass of Mountain Limestone, three-quarters of 

 a mile in length and a quarter of a mile in breadth, which has 

 been thrown over with the coal-measures, now overlies them, 

 at a distance of a mile from the parent mass whence it was 

 derived. 



4tli. — That through the folding of the coal-measures, lateral 

 pressure has been produced, causing a slide or overlap fault in 

 the centre of the basin, where the coal-veins and associated 

 beds have been thrust forward to the extent of 300 yards. 



From Kadstock the members were conveyed in brakes to 

 a cutting on the Evercreech line, at Lynch House, near Old 

 Down, where the New fled Conglomerate, the Keuper, the 

 Ehsetic Shales, and White Lias, are seen in a highly contorted 

 condition. Proceeding southwards towards Nettlebridge, an 

 ancient encampment was visited, called the "Bulwarks," sup- 

 posed by CoLLiNSON to be of Roman age. The party then 

 proceeded along the edge of the hill overhanging the Nettle- 

 bridge valley to Holcombe, where in an abandoned quarry the 

 abnormal dip of the coal-measures was pointed out. 



From, this point they proceeded to Upper Vobster, where 

 the isolated mass of Mountain Limestone overlying the coal- 

 measures, which has been already referred to, was esamined 

 at several points. This remarkable phenomenon in physical 

 geology completed the day's excursion, and is itself worth 

 going a long way to see. A huge mountain of Carbonifei-ous 



