Vol. 62.] PHOSPHATIC CHALKS OF WINTERBOTJRNE AND B0XE0RD. 513 



of the rubble-patch (h). It has the greenish colouring and pitted 

 surface of the flints in the Reading ' Bottom-Bed ' ; so that the 

 possibility of its having been carried some distance from its parent- 

 beds, in early Eocene times, must be added to that of its having 

 been shifted by human agency after its appearance in the soil. 



(i) Exposures by Rowhedge. 



Along the northern side of the timbered cultivation-bank named 

 Rowhedge, the Chalk, in many places, is so thinly covered by the 

 soil, that one may obtain a fair idea of the changes in the larger 

 lithological characters of its beds, from older to younger, while 

 walking up the slope towards Borough Hill. Below the 400-foot 

 contour-line the chalky soil is strewn with whole and broken flint- 

 nodules. At or about that line the nodules are, to a large extent, 

 replaced by fragments of tabular flint, which become scarcer higher 

 up. From a trial-hole a little above the 400-foot line, and about 

 20 feet below the level of the base of the Reading Beds, we got 

 samples of a soft, white, non-phosphatic chalk, with Uintacrinus. 

 Ten feet higher (where the chalk is disappearing beneath a heavy 

 wash of clay and pebbles) the same fossil and a stout example of 

 Porosphcera glohularis were found in white chalk, with small fish- 

 remains and rare phosphatized foraminifera. 



On comparing the positions of these exposures with those nearer 

 Wy field-Manor Farm, one gains the impression that the vertical 

 distance between the base of the Eocene Beds, on the one hand, 

 and the junction of the Uintacrinus-Ch.aXk with that containing the 

 tabular flints, on the other, is increasing towards the south ; and the 

 reality of this divergence is demonstrated a little farther on in that 

 direction. 



(j to r) Exposures near the Eocene boundary between Row- 

 hedge and a point 150 yards south-east of Iremonger's 

 Cottages. 



(j) — At or close below the boundary of the Reading Beds, 

 about 40 yards south of Rowhedge, there appear in the soil a few 

 rough pieces of hard, yellow, distinctly Phosphatic Chalk, containing 

 occasional green and brown concretions and impressions of sponges 

 (mostly Coscinoporct quincuncicdis and Ventriculites radiatus). 

 With these pieces of rocky chalk are associated guards of Actino- 

 camcLv, some of which are sufficiently well-preserved to be safely 

 referable to A. granulatus. Here we have found, also, part 

 of a dwarfed pyramidate Echinocorys scutatus, with a valve of 

 Plicatula sigillina attached, and a flint- cast of Micr aster cor- 

 anguinum,, var. latior. Farther south, the bits of hard chalk 

 become abundant and the belemnoids common, while the strip of 

 ground on which they occur widens and assumes a gentler trans- 

 verse slope. A trial-hole, made in a plough-furrow within this 

 belt, proved a mass of hard rubble less than 2 feet below the 



