Vol. 58.] JURASSIC OF THE SOUTH WALES DIRECT LINE. 733 
(c) The Cotteswold Sands. 
Lithologically, the Cotteswold Sands consist of a very thick 
series of micaceous sands, containing lenticular bands of hard sandy 
limestone which occur at very irregular vertical intervals. These 
bands die out rapidly in both directions, so that the hard beds 
encountered in one shaft are not usually the continuations of those 
met with in the next, but occur at different depths and at different 
intervals in the sand series. The total thickness of the sands can be 
estimated with considerable accuracy, for they are capped by the 
Cephalopod-Bed and lie immediately upon the Upper Liassic Series. 
Both these horizons are accurately determined by the labelled 
specimens obtained from the boring of the temporary shaft, just at 
the top of the escarpment (Shaft No.6). Making a small correction 
for dip (estimated as shown below), the total thickness of the sand 
serics 1s 185 feet. 
The sands themselves contain no fossils, but the hard beds are, as 
arule, extremely fossiliferous. On account of the exact lithological 
similarity of the beds at different depths, the relative horizons of the 
fossils derived from them cannot possibly be inferred. 
Ammonites of the striatulus-group occur on at least two different 
levels, for there are rock-specimens at the office which contain this 
form, but indicate by their labels very different depths below the 
top of the sands. We have also found this ammonite in a small 
exposure, at the side of the path that forms a short cut from 
Old Sodbury to the Cross Hands. Ammonites radians is very 
common in certain of the hard beds, but, so far as we know, 1s not 
associated with Amm. striatulus.! 
The following is a complete list of the fossils that we have obtained. 
from the hard sandy beds; it is impossible, however, to determine 
the relative vertical positions which they occupy in the series :— 
Ammonites (Grammoceras) striatulus, \ Amim. (Haugia) Eseri, Oppel. 
Sow.,and its mutations, in particular | Amm. (Harpoceras) subplanatus, 
Amin. toarcensis, d’Orb. Oppel. 
Amm. (Dumortieria) radians, Rein. | Pholadomya fidicula, Sow. 
(see footnote). | Ph, aff. Heraulti, Ag. 
Amnm. (Grammoceras) fallaciosus, 
Bayle, and a mutation. | 
Paleontological Notes. 
All the specimens of ammonites from these beds have been 
submitted to Mr. 8S. S. Buckman, F.G.S., who has very kindly 
confirmed or corrected their identification. 
? The bed containing Ammonites radians is placed by Mr. Buckman in the 
Cephalopod-Bed (see note on p. 736). 
