Vol. 62.] PHOSPHATIC CHALKS OF WINTERBOURNE AND BOXFORD. 511 



waved, but have, on the whole, a gentle (apparent) dip towards the 

 east-ncrth-east. 



Flinty chalk of the Micraster cor-anguinum-Zone is to be seen 

 also in many small workings near the bottom and on the sides of the 

 Winterbourne Valley, above and below the village, in some places 

 close upon the boundaries of the Eocene Beds. These exposures 

 it is unnecessary further to notice. 



In the sloping ground on the eastern side of the Borough-Hill 

 spur we have evidence, then, of the following downward 

 succession : — 



1. Heading Beds of the Borough-Hill outlier. 



2. Chalk with some flints, above pit (a). 1 Zone of Actinocamax 



3. Phosphatic Chalk, in pit (a). J quadratus. 



4. Phosphatic Chalk { ^ d P ^ ure (b) . } itto^te-Band. 1 I § 



5. Very feebly Phosphatic Chalk, in exp. (c). Ui?itacrimis-'Ba,nd. IzL o 



6. Chalk with tabular flints, in exposure (d). "I Zone of Micraster S° 



7. Chalk witb flints, in pit (e). j cor-anguinum. 



The inconstancy of the dips in the Chalk makes it difficult to 

 form just estimates of the thickness of the beds ; but we think it 

 unlikely that the upper and lower stratigraphical limits of the zone 

 of Marsupites are much more than 30 feet apart in the immediate 

 vicinity of Pit (a), a quarter of a mile north-west of Winterbourne 

 Church. (See section, fig. 3, p. 510.) 



III. Exposures in the Parish oe Boxford. 



Pour out of the five Winterbourne exposures just dealt with fall 

 within a narrow belt of country having an east-and-west trend. 

 The more numerous exposures on the western, or Boxford, side of 

 Borough Hill have, on the whole, a roughly north-and-south 

 arrangement, and consequently furnish us with a fragmentary 

 section at right angles to that given by the first series. 



Beginning on the north, the first rubbly patch to be noticed is 



(f ) One furlong north-east of Wyfleld-Manor Farm. 



This is against the old hedge-bank which marks the Boxford- 

 Winterbourne parish-boundary. The little chalk visible is soft, 

 white, and fine-grained ; it contains a few small fish-remains, but 

 no phosphatized foraminifera. The only noteworthy organism 

 represented in the samples taken was Uintacrinus. 



(g) Pit 1 furlong west of Wyfleld-Manor Farm. 



This shows 8 feet of soft, white, blocky chalk, with a very few 

 scattered nodules of flint near the top, and a thin seam of tabular 



2m 2 



