I894-95-] 20 5 



lecturer had afforded the Field Club such a treat as had scarcely 

 ever been enjoyed within the old Museum walls. The 

 resolution was passed in an enthusiastic way. 



1 8 December, 1894. 



The third winter meeting was held in the Museum on 

 Tuesday evening, 18 December — the President, F. W. Lockwood, 

 C.E., in the chair — when the evening was devoted to geological 

 papers by the members. The following " Notes on Moel 

 Tryfaen" was contributed by Miss Mary K. Andrews: — 



Moel Tryfaen is an outlier of Snowdon, situated five miles 

 south-east from Carnarvon, and about five miles in a direct line 

 east from the sea. It is a hill of rounded form, largely covered 

 with drift deposits, while on the top great masses of Cambrian 

 conglomerate stand out, giving it a characteristic castellated 

 appearance. The high-level "shell-bed" by which it has 

 attained world-wide celebrity is quite 1,350 feet above the level 

 of the sea. It was first discovered by Joshua Trimmer, and 

 described in a letter addressed by him to Dean Buckland, read 

 before the Geological Society on the 8th of June, 1831. From 

 this letter it appears that near the summit of Moel Tryfaen, in 

 a boring made through sand and gravel in search of slate, at 

 about twenty feet below the surface, Joshua Trimmer found 

 marine shells in a bed of sand, for the most part broken, 

 resembling the broken shells on the adjacent beach. The 

 fragments he considered to include Buccinum, Venus, Nalica, 

 and Turbo. This latter S. A. Stewart identifies as Trochus. 

 Joshua Trimmer also observed that, when the surface of the 

 slate rock is newly laid bare, it is found to be covered with 

 scratches, furrows, and dressings, and refers these to the action 

 of diluvial currents, which overspread the country with gravel. 

 From this date Moel Tryfaen occupies a foremost place in 

 geological history, its shells have been carefully enumerated, 

 and its deposits examined with care, while the mode of their 



