100 



MESSRS. JUKES-BEOWNE AND SCANES ON THE [Feb. I90I, 



Horningsham Plantation rises to 749 feet, without any trace of the 

 Chalk being found, though we have specially looked for it ; the soil 

 on the top of the ridge is sandy with fragments of chert. Thus, 

 even if the actual base of the Malmstone is not below the contour 

 of 500 feet, there seems to be 250 feet of Upper Greensand here, 

 which is a much greater thickness than can be inferred to exist 

 elsewhere in this part of Wiltshire. 



Fossils from the Lower Sands of the Selbornian. 





Glauconitic 

 sand. 



Malmstone. 



Gault. 



Ammonites aiiritus. Sow 



A. rostratus, Sow 



* 



* 

 * 



* 



* 

 * 

 * 



* 



* 

 * 

 * 



* 

 * 



A. splendens, Sow 



A. denarius, Sow 



Exoqyra conica, Sow 



Ostrea canaliculata, Sow. 



0. vesicularis, Sow 



0. vesiculosa, Sow 



Pecten Fuzosianus, d'Orb. . . . 

 P. orbicularis, Sow 



Neithea quadricostata (d'Orb.). 



N. quinquecostata (Sow.) 



Flicatula (?) ep 



Modiola reversa, Sow 



Pleuromt/a mandibula (d'Orb.' 

 P. (?) sp 



Area carinata, Sow 



Terebratulina, Martiniana ('!), 

 d'Orb 





Note. — Pecten asper has been found, in the green sand with large blocks 

 or doggers of calcareous sandstone, which comes in below the Chert-Beds. 



Y. Exposures oe Chert-Beds and Chloritic Marl. 

 Maiden Bradley. (Fig. 1, p. 101 & PL IV.) 



The most important section of these beds is that at Maiden 

 Bradley, a village which lies in a hollow or combe facing northward, 

 with slopes of Chalk-Marl and Chalk rising to the west, south, and 

 east of it. The quarry exposing the junction of the Chalk and 

 Greensaad is situated on the west side of the village, about 

 I mile north-west of the church. It was opened to obtain chert 

 and stone for road-metal, but has not been worked much during 

 the last few years, because of the increasing thickness of sand and 

 marl which has to be removed as the face is cut back. 



Eossils from this quarry have found their way into several public 

 and private collections : in some they are labelled as coming from 

 the junction of the Chalk and Greensand, in others they are re- 

 ferred to the Chloritic Marl. The real fact is that the quarry 

 traverses both Chloritic Marl and Upper Greensand, and that both 



