128 
THE GEOLOGIST. 
5. Stiff Blue Clay . 5 feet . ^Vith Ammonites Henlei/i, Pemavenfricosa, 
and Myacites. 
0. Hard stiff Blue Clay 12— 1 4ft. With Ammonites fimlriatus, A. margari- 
tatus, A. Henlei/i, Perna ventricosa, and 
small Pentacrinite. 
7. irregular band of lime-» Unicardium cardioides, Cardi'iiea concinna^ 
stone, generally formed of Myacites tumidus ij'), Modiola scalpmm, 
a mass of shells . . . GrervilUa Icevis, Perna ventricosa, Lima 
(small), Ostrea (small), Pecten SKblcevis, 
Flagiostoma Sermanni, Terehratv.la nu- 
mismalis, RhynchoneUafiircillata, R. con- 
cinna, R. subconcinna, Pentacrinus. 
The upper shelly bed (No. 2) undulates ; the distance between the 
crest and the trough of the wave being about a hundred yards, and 
the depth of the trough about six feet. This is very much stained 
with oxide of iron. 
The clayey beds Nos. 3, 5, 6, have fossiliferous concretionary nodules, 
and are all very similar ; they contain but few fossils, and those mostly 
of the same species. Bed ISo. 7 is also stained with iron, but not so 
much so as bed No. 2. It is very irregular as to its composition ; 
the stony bed being often interrupted by coarse concretionary masses 
at some distance from each other. This bed I also found at Odding- 
ton, four miles from the railway-cutting ; and there it is only just be- 
neath the surface-soil, so that there must have been considerable 
denudation. 
I should think that the Upper Lias Clay is much thicker in this 
locality and at Chipping-Norton than is generally supposed. Mr. 
Bliss, the owner of the factory there, told me that he bored 500 feet 
without getting through the clay. This is where it crops from be- 
neath the Inferior Oolite. 
Though the beds above described may possibly belong to the 
Middle Lias, yet I think there is much evidence to the contrary, 
such as the close contiguity of the Inferior Oolite, especially the 
" passage-sands," with the ferruginous ammonite-bed. At Odding- 
ton, about three miles from the cutting, these sands rest directly on 
bed No. 7 of the section. 
TEAILS, TRACKS, AND SUSFACE-MAEKINGS. 
By T. EtJPEST Jones, F.G.S. 
(jreologizing, with some friends, on the south coast of the Isle of 
Wight, a few summers since (1859), we noticed some puddles of 
rain-water in the clay talus of the Wealden Cliffs near Brook Point, 
and observed that, like other such surfaces, the partially dried clay 
beds of the diminished pools showed rain-prints, foot-tracks, trails, 
and the rings of broken bubbles. Amongst these various markings are 
convex tYda\-\\\Q lines (fig. 1), which at first appeared difficult to account 
