ON THE DRIFT AT MOEL TRYFAEN. 415 
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.R.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.8.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.S.W. end of section 
looking 8.S.W. 
8. Duplicate, showing a little 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, Dr. Hicks, visited the section 
on September 26, 1898 ; and on November 5, 1898, Messrs. Kendall, Lamp- 
lugh, Lomas, Mellard Reade, Shone, and the Secretary examined it and 
recorded the facts embodied in this report. OnJuly 1, 1899, the Secretary 
added items 1, 2, and 9. 
As there has been serious difference of opinion as to the interpre- 
tation of the Moel Tryfaen phenomena, the Committee wish to emphasise 
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 Hill-top—About 800 ft. 
E.S.E. to the middle of the section. 
2. Length of Section.—From 700 to 750 ft. 
3. Direction of Section.—The sections are in curves concave to N.N.E. 
and 8.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. 
4. Height of Rock Surface.—The floor of Gallery ‘No. 1,’ the highest 
in the Alexandra Quarry, is at 1,281 ft. above sea level. The surface of 
the rock emerges from below drift in the floor of this gallery a few yards 
