70 Geological Society. 
to Llandegfan : but last summer he had the opportunity, through the 
courtesy of Sir E. B. Williams, of examining- the cuttings made in 
constructing a new drive, which runs through Baron Hill Park very 
near the above outcrops. After tracing the normal schists along 
the steep scarp of the hill, he came, after an interval of about 60 
yards, covered by soil and vegetation, to a massive grey grit con- 
sisting of quartz, felspar, and minute fragments of compact felsite. 
■which now and then attain a larger size, being an inch or so across. 
These grits, which pass occasionally into hard compact mudstones 
(probably more or less of volcanic origin), can be traced for some 
350 yards to the neighbourhood of the above-mentioned road, 
which is crossed by a bridge ; and a short distance on the other side 
of this is a considerable outcrop of the grit, which in places becomes 
coarsely conglomeratic, containing large fragments of the reddish 
quartz felsite so common on the other side of the straits in the beds 
at or below the base of the Cambrian series. The schists appear to 
dip about 2U : E.S.E.. the grits about 25 E. 
The author, after describing the microscopic structure of the 
various rocks noticed, pointed out that this section, though the junc- 
tion of the two rocks is probably a faulted one, has an important 
bearing on the question of the age of the Anglesey schists, mica- 
ceous and chloritic. The Survey regards them as altered Cambrian; 
it has even been suggested that they may be of Bala age ; others 
have regarded them as Pebidian. Xow the felsitic grits and con- 
glomerates cannot be newer than the Cambrian conglomerate of the 
mainland, regarded by Prof. Hughes as the base of the true Cam- 
brian, and are probably older, corresponding with some part of the 
series between it and the great masses of quartz felsite which are 
developed near Llyn Padarn and Port Dinorwig. which series litho- 
logically and stratigraphically corresponds with the typical Pebi- 
dian of Pembrokeshire. Hence, as the Anglesey schists are in the 
full sense of the term metamorphic rocks, and the " Pebidian " but 
slightly altered, this section shows that the former must be much 
older than the latter, and so be distinctly Archaean. 
3. •'' On the Eocks between the Quartz Felsite and the Cambrian 
Series in the neighbourhood of Bangor.'' Bv Prof. T. G. Bonnev, 
M.A.. F.R.S., Sec.G.S. 
This district has already been the subject of papers by the author 
(Q. J. Gr. S. vol. xxxiv. p. 137) and by Prof. Hughes (vol. xxxv. 
p. 682), who differs from him in restricting the series between the 
quartz felsite and Cambrian conglomerate to little more than the bas- 
tard slates and green breccias of Bangor mountain. The author has 
traced on the S.E. side of the Bangor-Caernarvon road a well-marked 
breccia containing fragments of purple slate mixed with volcanic mate- 
rials below the above-named Bangor series for more than a mile ; at 
a lower level he has traced another well-marked breccia, chiedy of 
volcanic materials, for half a mile, and, lastly, a grit and conglo- 
merate, apparently resting on the quartz felsite named above, com- 
