42 ME. A. M. DAVIES ON THE KIMEEIDGE CLAr [Feb. I907, 



of it in a ditch on the east side of Stanton Great Wood ; and from 

 here I have been able to trace it almost continuously in both direc- 

 tions, for a distance of quite 2 miles in all, by the abundance of its 

 fragments in the brooks and ploughed fields. In the south-easterly 

 direction, its last appearance is on the eastern side of Holton Wood ; 

 in the other direction, it can be traced as far as the site of the old 

 church at Woodperry ; and again it can be seen in the road-cutting 

 a little beyond, where there is a considerable thickness of calcareous 

 sandstone above it. Where it precisely dies away in this direction 

 I cannot say, but there is no trace of it at Beckley Upper-Park Farm. 

 Here, and round by Beckley Common to Stowood, the base of the 

 Calcareous Grit is formed by a considerable thickness of reddish 

 sands. 



The only other point where there seemed to be a prospect of 

 finding it is above Bayswater Mill (fig. 2, no. 8, p. 41), in the valley 

 of the Bayswater Brook, where the outcrop of Lower Calcareous Grit 

 has been cut back to within nearly a mile of Stanton St. John. 

 But here also the base is sandy, and I found no trace of Arngrove 

 Stone. It must, therefore, thin away underground rather rapidly 

 to the south-west of Stanton St. John. 



Along the greater part of this 2-mile outcrop, although no clear 

 sections are seen, the overlying strata seem to be clayey. It is 

 remarkable that, just where the chert dies away, the overlying strata 

 become sandy. This is the case at both ends of the outcrop. At 

 the south-eastern end, the sandy beds can be traced from Holton 

 Wood, past Warren Farm, to near Pond Farm, fragments of iron- 

 stone being abundant in the sandy soil between the two last-named 

 places. Beyond this, it is difficult to find any evidence for the definite 

 boundary drawn on the Geological-Survey map. Only at one point 

 — at the pond near Ledall Cottage— is an obscure section showing 

 coarse sand and ironstone, just at the mapped junction ; but both 

 north and south of this point the soil is clayey, and large Gryphseas 

 are thrown up in all ponds and other diggings. Fragments of ironstone 

 are also common in the soil near Thomley Hill, and again 3 miles 

 farther north, near Boarstall Wood. These occasional breaks in the 

 great monotony of clay may be indications of Drift, rather than of 

 intercalations in the solid strata; but the absence of clear exposures 

 makes it very difficult to judge. What is clear is, that the Arngrove 

 Stone extends over a much smaller area than that bounded by the 

 unbroken boundary-line on the Geological-Survey map. Its actual 

 outcrop and probable original area of deposit are indicated in the 

 sketch-map (fig. 2, p. 41). 



The following is a list of the fossils collected from the Arngrove 

 Stone, mainly at Arngrove itself. The species marked D 1 have 

 found myself ; those marked S are added on the authority of the 

 Geological-Survey Memoir and the specimens in the Jermyn-Street 

 Museum ; those marked P are noted by Phillips. Many of the fossils 

 are casts or impressions ; and, where the shell is preserved, the 

 specimen is often incomplete through truncation by a joint-plane. 



