ON EXCAVATIONS IN THE PALHOZOIC ROCKS OF WALES, ETC, 139 
The fossils at 9 to 10 yards are, in many eases, identical with those of 
the Olenellus-Limestone of the Comley Quarry, but are embedded in 
green sandstone instead of in the pinkish or red calcareous rock of the 
Quarry. 
The red and green sandy shale at 28 to 30 yards is so like the rock 
immediately below the Olenellus-Limestone of the Quarry (see Dublin 
teport, 1908) that it is probable that the latter occurs close by. A few 
yards down-stream a very characteristic pink calcareous nodule was found 
among the drift pebbles of the bed of the Brook. 
The occurrence of the dark calcareous nodules and burrows or tracks 
further up-stream suggests a comparison of the beds there with those of 
Robin’s Tump (see Sheffield and Portsmouth Reports, 1910, 1911). 
Excavation No, 47, Comley Brook. 
At about 40 yards south-south-east of No. 13 (Dublin Report, 1908) 
a smali excavation in the left slope of the valley disclosed brownish 
shale, with bands of hard ringing grit, dipping at about 45° to the south- 
west. These rocks, which are in complete agreement with those found 
in Excavations No. 13 (Dublin Report, 1908) and No. 46 (above) I refer 
to the group Quarry Ridge Shales. 
Excavation No. 49, Comley Brook, South-West Slope. 
At about 80 yards up-stream from the commencement of Excavation 
No. 47 (above), there is a rocky shoulder the foot of which has been 
cut away to make room for a cart-track between it and the stream. Tho 
rock seen consisted of green sandstone, and on clearing away the so:] 
and herbage a section was exposed which appears to be of special 
interest both from stratigraphical and paleontological points of view. 
At first I found here several species belonging to the Olenellus 
(Protolenus-Callavia*) fauna, and then, apparently from the same 
material, a pygidium of a Paradoxides which may be referred to P. 
Hicksii (Salter) or to one of its allies. On further study of the 
section it became evident that just at this point Lower Comley Sand- 
stone, with some calcareous nodules (Lower Cambrian), and of the 
same horizon as that found at distance 9 to 10 yards on Excavation 
No. 47 (see above, p. 138), has been broken up to form a breccia with 
but little addition of extraneous material, so that the matrix and the 
included blocks have very much the same lithological aspect. 
In the upper part of this ‘ Breccia Bed’ the matrix is somewhat 
calcareous and there are comparatively few included blocks. In the 
median portion of the bed the included sandstone and limestone blocks 
are very plentiful, and the original interstices between the blocks are 
filled up with a matrix of sand clearly derived from the disintegrated 
ruins or wash of the same materials as those of which the blocks are 
composed. At the base the bed consists of fractured sandstone with 
little, if any, matrix between the fragments. Below this the green 
sandstone seems to be intact, but is not fossiliferous. 
* Cobbold, @./.G.8., vol. Ixvii., 1911, p. 297. 
