The Quarterly journal of the Geological Society of London . he cave itself was almost pure and extends to an unknowndepth. In the northern part of the ca^e, between the plastic andlaminated clays, there was a lenticular mass of yellow clay describedabove, such as we have not met with elsewhere in the ex-cavations. The cave is enclosed on all sides by solid rock, and the onlyoutlet must be below. We have excavated 8 feet below the levelof the passage without finding a floor, and for the present we have Vol. 54.] EXPLORATION OF TY NEWYDD CAVES. 125 ceased to explore further. In the walls of the
The Quarterly journal of the Geological Society of London . he cave itself was almost pure and extends to an unknowndepth. In the northern part of the ca^e, between the plastic andlaminated clays, there was a lenticular mass of yellow clay describedabove, such as we have not met with elsewhere in the ex-cavations. The cave is enclosed on all sides by solid rock, and the onlyoutlet must be below. We have excavated 8 feet below the levelof the passage without finding a floor, and for the present we have Vol. 54.] EXPLORATION OF TY NEWYDD CAVES. 125 ceased to explore further. In the walls of the passage and rightround the cave there is an horizontal fissure 2 to 3 feet high, filledwith blue clay. This we have not removed, as the roof appears tohave no other support and is here much broken. There is, how-ever, no fissure connecting with the surface, since we made anartificial tunnel through solid rock right across the roof of thecave (see plan, fig. 2). Fig. 3.—Section No. 1 in the Eas^fern Cave. L_ Datum 425 Ff^ above nisturbe^ ^$Gsf3 i-L. A SPoints oFintersectiB I of sects. 2 and 3. The following are the measurements taken during the excavation :the positions can be seen in the plan (fig. 2, p. 124), in whichthe number of each section is given in Arabic numerals. At the junction of Sects. \ Sf 2. Ft. ins. Disturbed Laminated clayClayey gravel ...Laminated clayClayey gravel ...Laminated clayClayey gravel ....Laminated clayClayey clayCoarse gravel ... Junction of Sects. 4 Sf 5,at mouth of Eastern Cave. Sand Plastic clay Sandy gravel ... Sand Laminated clayBlue clay Ft. ins. 6 0 4 310 0 Junction of Sects. 1 ^ 3. gravel ...Laminated clayClayey gravel ...Laminated clayClayey gravel ...Laminated clayClayey gravel ...Laminated clayCoarse gravel ... Ft. ins 1 0 6 1 0 6 4 6 2 8 3 3 Middle of Sect. 6. 6 feetpassage of Eastern Cave. Ft Sand Sandy gravel Plastic clay Clayey gravel Laminated clay and I , gravel , Blue clay and san
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