460 
REV.  J.  E.  RLAKE  OR  EELSITES  ARE 
[Aug.  1893, 
Horizons. 
Bhiw-wen 
Grit. 
f 
f 
1 
Pale  Banded  J 
Slates.  } 
L 
Bangor  Con¬ 
glomerate. 
Pale  Banded  j 
Slates.  1 
Laminated. 
Grits  with, 
finer  Bangor 
Breccia. 
•{ 
Tairffynnon  , 
Breccia.  ' 
Lower  Lami¬ 
nated  Grits. 
Section  along  the  Moel  Tryfaen  adit. 
Massive  Purple  Slate  . 
1.  Compact  green  grit  . 
2.  Conglomerate  of  quartz-pebbles  in  1 
a  green  gritty  matrix ;  pebbles  not  L 
abundant  . J 
3.  Irregular,  small-pebbled  conglome- 1 
rate  with  matrix  more  felsitic .  f 
ft.  in. 
ad  lib. 
11 
6 
8  0 
4.  Very  fine-grained, obscurely-laminated.  1 
slaty  grim  . J 
5.  Compact  massive  green  grit,  without  1 
visible  grains,  changing  to  compact  151 
green  slate  . . 
|  6.  Pink  felsite  changing  to  felsitic  grit 
} 
7.  Fine  green  grit  to  slate . 
8.  Beautifully  banded  green  slate . 
9.  Very  compact  green  slate . 
10.  Small  breccia  of  purple  and  green  1 
fragments  . . . . . J 
11.  Massive  dark  purple  slate . 
12.  Dark  purple  grit . 
13.  Bather  coarse  felsitic  grit ;  quartz 
grains  from  insets  abundant  . 
14.  Compact  dark  purple  grit . 
15.  Coarse  grit  similar  to  13  . 
16.  Compact  dark  purple  grit,  like  14  ... 
17.  Coarse  purple  grit . 
18.  Compact  purple  grit . 
19.  Earthy  grit,  like  10  . 
r  20.  Black-scale  rock  (?  altered  1 
Dyke  lamprophyre)  . . . j 
L  21.  Fresher  ditto . 
22.  Purplish  quartz-grit . 
23.  Cleaved  felsite-tuff,  or  felsite  contain¬ 
ing  small  foreign  fragments . 
24.  Loose  felsitic  agglomerate,  lapilli  of' 
decomposed  felsite  1 . 
25.  Felsite-tuff,  like  23 . 
26.  Earthy-looking  felsitic  grit  . 
27.  More  compact  ditto  . 
28.  Compact  green  felsite  . 
29.  Light  crystalline  felsite  . 
Dyke  [  30.  Dark  purple  basic  rock  . 
31.  Green,  very  felsitic  grit  . 
32.  Mylonized  green  felsite . 
} 
32 
0 
151 
3 
4 
5  F 
124 
5 
50 
0 
191 
4 
32 
4 
35 
0 
42 
0 
72 
0 
47 
0 
54 
6 
16 
7 
9 
10 
4 
0 
6 
5 
39 
4 
32 
6 
28 
9 
11 
10 1 
1 
20 
ft 
— * _ 
05 
21 
°j 
5 
0 
54 
3 
24 
ft 
0  0 
64 
40 
0 
56 
6 
79 
0  F 
1368 
5 
1  A  far  more  compact  felsitic  breccia,  collected  on  a  previous  occasion, 
probably  belongs  here,  but  the  exact  type  was  not  again  met  with. 
