116 Report on the Moel Tryfaen Drift. 



surface; (2) they show the nature and position of the junction of 

 the shelly sands and gravels with the overlying Boulder-clay ; 

 (3) the false bedding and other structures iu the sands and gravels 

 are best seen along them ; (4) they have been more accessible than 

 the other sections in the quarries. A Committee was therefore 

 appointed to preserve, by photography, supplemented by a written 

 report, an impartial record of the phenomena displayed in these 

 sections. The Committee have much pleasure in acknowledging 

 their obligations to Mr. Menzies, the manager of the Alexandra 

 Quarry, who, with a large-minded appreciation of scientific work 

 for which geologists cannot be too grateful, offered to suspend 

 operations in that part of the quarry for three months, besides 

 showing the Committee every hospitality and facilitating their work 

 by all means in his power. 



Photographs. — Six whole-plate and five half-plate photographs 

 were taken by Mr. John Wickens, F.E.P.S., photographer, of 

 Bangor. 



The views taken are : — 



1. General view of section from W-N-W. end. 



2. General view of section from E.S.E. end. 



3. General view from W.N.W. of Moel Tryfaen Quarry, including neighbourhood. 



4. Boulder-clay by engine-house at E.S.E. end section. 



5. Sands seen below Boulder-clay. 



6. Junction, wedge of Boulder-clay in sand and gravel. 



7. Base of sands and terminal curvature near W.N.W. end of section looking 



s.s.w. 



8. Duplicate, showing a Uttle more of slate. 



9. Similar phenomena on N.E. side of quarry (third gallery) looking N.N.E. 



10. Duplicate, a little nearer. 



11. Rocks on summit of hill from N."W. 



Description of Section. — The Chairman, the late Dr. Hicks, 

 F.K.S., visited the section on September 26, 1898 ; and on 

 November 5, 1898, Messrs. Kendall, Lamplugh, Lomas, Mellard 

 Reade, Shone, and the Secretary examined it and recorded the facts 

 embodied in this report. On July 1, 1899, the Secretary added 

 items 1, 2, and 9. 



As there have been serious differences of opinion as to the inter- 

 pretation of the Moel Tryfaen phenomena, the Committee wish to 

 emphasize the statement that this report is intended to be a record 

 of observed facts only, without reference to any conclusions that 

 may be drawn from these facts. 



The observations are here arranged under thirteen heads. All 

 the details were examined from the side of the Alexandra Quarry, 

 which was the better and more accessible section of the two. 



1. Bearing and Distance of Section from Hilltop. — About 800 feet 

 E.S.E. to the middle of the section. 



2. Length of Section. — From 700 to 750 feet. 



3. Direction of Section. — The sections are in curves concave to 

 N.N.E. and S.S.W. in the "Alexandra" and "Moel Tryfaen" 

 Quarries respectively, so that a tangent to both curves at their 

 nearest point, about the middle of each section, is about 

 W.N.W.-E.S.E. 



