Page:Quarterly Journal of the Geological Society of London, vol. 27.djvu/673

 thick, interspersed with calcareous stripes. From this stratum (No. 1) small burrows or pipes have been sunk through the strata Nos. 2 & 3, and form cavities in No. 4, as delineated in Section N. Some of these curious excavations are several feet in depth ; and in some instances the lower part is 18 inches wide, while the pipes leading to them are only a few inches in width ; they appear to be the work of some of the old inhabitants of that ancient sea. They are now all filled with the sandy marl of No. 1, with which are mixed small nodules, and, in some of the pipes, fragments of shells, evidently all washed in from above, when the apertures leading to them were open.

These clays dip E. by S. at an angle of 20°, and have been denuded, as shown in the Section. The sandy marl and the outcrop of the clays are covered with surface-soil, the lower part of which is interspersed with beds of well-worn quartzite pebbles, in some parts to a thickness of from 1 to 3 feet. In some places there is a small deposit of calcareous tufa between the underlying clays and the surface-soil.

In another excavation, near the same spot, I obtained a rather different section of these stratified clays exposed for about 39 feet, as seen at c, in Section (fig. 4). The dip here varied from 10° to 20°. Whether the clays of these two last-mentioned Sections (N

Fig. 5. — Section of the beds marked d in Fig. 4 *. (Section P of Author.) From an excavation made for a large tank.

Soil and pebbles.

Tufa, 12-18 inches.

Rather friable sandstone, interspersed with carbonate of lime, 2 feet.

Tufaceous limestone, 5-7 inches.

Sandstone, interspersed with carbonate of lime, 13 inches.

Tufaceous limestone, 1 foot.

Sandstone, 3 feet.

Sandy limestone, 6 inches.

Sandstone, 7 inches.

Sandy limestone, 6 inches.

Sandstone, 1 foot.

Reddish sandstone.

Bottom of excavation.

and 0) are continued across the Salt Ylei to the opposite outlier d in Section O (fig. 4), I am not able to say, as the sides of this hill are


 * Possibly this section includes some Posttertiary deposits.