Vol. 62.] PHOSPHATIC CHALKS OF WINTERBOURXE AND BOXFORD. 515 



those obtained from the upper part of bed (5) of the Winterbourne 

 (a) section — small lumps and platy pieces of calcite and Rotaline 

 foraminifera being the chief constituents. Phosphatized fora- 

 minifera (as usual, mainly Globigerina and Textularia), coprolites, 

 fish-remains (which are responsible for the pink tinge), and black 

 grains, all are common. "When treated with hydrochloric acid, a 

 small proportion of the phosphatized material (foraminifera, and 

 grains or chips of uncertain origin) remains as pale-green trans- 

 lucent or opaque glauconite. Quartz-grains are very small, and rare. 

 The fossils collected include : — 



Inoceramus sp. 

 Ostrea vesicularis, Lain. 

 Rhynehonella reedensis, Eth. 

 Clausa Francqana, d'Orb. 

 Yincularia sp. 



Cythcrella Williamsoniana, Jones. 



Cidaris sceptrifera, Mant. 



Gidaris hirudo, Sorig. 



Asteroid ea. 



Porosphcera glolmlaris (Phill.). 



Cythereis ornatissima (Reuss). Porosphcera patelliformis, Hinde. 



Cytherella ovata (Romer). Porosphcera sp. 



Exposure (m). — At this place, on the northern slope of the 

 little dale heading in Borough Copse, there is a broad spread of soft 

 rubble, the chalk in and beneath which is distinctly phospbatic. 

 A few broken guards of Actinocamax granulatus (?), a stout Poro- 

 sphcera globidaris, and pieces of Micraster and Echinocorys, occur 

 in the upper part of this patch, and plates of Marswpites in the 

 lower — where there are clear indications of a thin band of hard, 

 nodular rock similar to, and probably on the same horizon as, 

 the bed numbered (2) in the Winterbourne (a) Pit. 



At (n), in the bottom of the dale, about 150 yards south-south- 

 east of this, and perhaps 20 feet lower, the plough has turned up 

 soft, white, non-phosphatic chalk containing Uintacrinus. 



Prom Borough Copse southward to the hedge west of the Roman 

 Villa, there are frequent indications of a hard, yellowish chalk, with 

 sponge-casts, a little below the 400-foot line, the plainest being 

 at (o), where there is a small but distinct step or terrace in the 

 slope, covered thickly by the debris of that rock. A little to the 

 north-west of, and below this feature, gritty, phosphatic chalk, like 

 that of the Jiarswpte-Band, occurs in the soil ; and, still lower, 

 the rubble of the Uintacrinas-Be&s. 



The same downward succession has been proved at the spot 

 marked (p), and firm white chalk with tabular flints observed in 

 the bottom of the dale, at 1 furlong to the north-west. 



Between exposure (p) and Iremonger's Cottages, the Chalk is 

 hidden by a ' creep ' of pebbly clay ; but at the latter place (q) soft 

 though lumpy, white, non-phosphatic beds with thick bands or 

 lenticles of very hard, yellowish-white, slightly-phosphatic rock 

 containing green concretions and hollow casts of sponge-spicules, 

 crop out in the cultivated ground immediately to the west, and, at a 

 rather higher level, to the south, of the buildings. The wash-residues 

 of the softer chalk here differ from those of all the chalks hitherto 

 noticed, in consisting very largely of remains of bryozoa (notably 

 Crisina and Vincularia), associated with those of Pentacrinus. 



