270 MESSRS, STRBAHAN AND WALKER ON PEBBLES 
Bastard Limestone, containing two beds of green sandstone ft. in, 
pebbles im aysandiyamathix esses ese eee eacestee eee eer LOO 
Conglomerate of red and green sandstone pebbles in a mottled 
red and green sandy matrix, the pebbles varying in size from 
that of a walnut to that of a flattened cricket-ball ............ 12 0 
Bastard mmestone! Radek: <5 sated ee as aaee CREE REEMA ere CEs 1G 
1 Battave vs ashy) Whats see Nae GO coEenOne se conUn nS aaduenrae cote looroc cdecuncaad stone 0 8 
Red shale <.....sccs+-+6 dovovbocnabca9osad0u0N0baoboe0nNDAC iaieaiesote den 3 0 
Bastard aiimestoneressecaswmcesacisacounseucn sete merci ocean se meee oe ner i @ 
Hard red sandstone crammed with green and red sandstone 
JOSITES  cososcooosessn0nqca shoo ssbsosandesocucooodoedoconsscooaceadHadcaoe 0 
Bastard Limestone ...... TOUORO DOC HAC HRSG Gunue ap onainnoce nan ac ase ane ane oe ie 
Soft, red, micaceous sandstone with pebbles ...............0..0e0e0e 6 0 
Thick deep-red clay, crammed with liver-coloured sandstone 
pebbles, micaceous, flattish, and’ fissile, the largest 1 foot 
ACROSS ly? 7 Or G) MNCS HME!s  SosoocudpnsnotdocoduunocvbaccooDouDGcKE 0 0 
Soft red sandstone with green blotches ..........ssecsesseeseesesees 3.0 
Deep-red marl, weathering into cubes or rhombs (resembling 
some beds at the base of the Keuper marls of Cheshire) ...... 3.0 
Coarse conglomerate of purple sandstone pebbles.................. 6 0 
Sottabright-nedusandStOme et occm-anacssensaceseedoceseceenmscetnes 10 0 
Thick deep-red clay, crammed with pebbles (bed e of Mr. Bow- 
THANG) Yay canepeionoodenoge duanaesponocnatnnc uasonc sare ooaaBabaodendes lon saess 
The last-named bed, with a few sandstones, occupies the remainder 
of the dingle, and continues over Pen-y-Cefn and down the slope to 
the north to near the foot of the limestone escarpment, a distance of 
more than 1000 yards; its thickness must therefore be very great. 
It is everywhere crowded with pebbles of red and purple sandstone, 
liver-coloured when fine-grained, and purple and very micaceous 
when coarse-grained. They are all fissile, and when split open 
disclose casts of numerous fossils. They vary in size from 14 inches 
x 8 inches x 33 inches to an average of 4 inches x 24 inches 
x 1d inch. They are dissimilar to any rock known in setw in the 
district, and are invariably waterworn, generally to a flattened oval 
shape, but occasionally subangular. The whole deposit is well stra- 
tified and pervaded by current-bedding, without any appearance of 
ice-action. Throughout this vast mass of pebbles there is no other 
rock than the fine and coarse-grained red sandstone. 
Overlying this thick bed, and occupying the slopes immediately 
under the Carboniferous Limestone, are some conglomerates of green 
and yellow sandstone pebbles in a red and green matrix, and asso- 
ciated with mottled red and green shales. Some of the pebbles 
differ slightly from the last described in being tougher and less 
fissile, but the majority are similar except in colour; they also 
contain the same fossils. No hard and fast line can be drawn sepa- 
rating the red conglomerates of Ffernant from these mottled beds ; 
and the difference 18 probably due partly to their having been 
derived from a variegated rock, partly to subsequent alteration. 
Some of the pebbles in the upper beds are partly green and partly 
red. 
The red and green shales and conglomerates are succeeded by the 
Carboniferous Limestone, the lowest beds of which contain Eneri- 
nites, Producti, Athyris, and Foraminifera in abundance. The junc- 
tion is visible in a farmyard near Bryniau Cochion, where red- 
