Yol. 57.] 



OF ST. IVES AND ELSWOETH. 



77 



The Gryphoia and Ammonites plieatilis were abundant, and 

 constantly overgrown with Serpula. The rock is exposed at 

 intervals for nearly | mile across the strike. Above the stream 

 on the west the Rock may be traced farther north by the yellowish- 

 brown surface-soil and rock-fragments. 



About 1100 yards north-east of Yelling is a pond on the 

 hillside. The excavated material contained blocks of yellow and 

 whitish- weathered limestone with iron shot grains : here, and from 

 oolitic fragments on the surface, I obtained : — 



Gryphaa dilatata, Sow, 

 Ostrea flaheUoides, Lain. 

 0. {Alectryonia) gregaria, Sow. 



Vermilia sulcata (?) Sow. 

 Biastopora (Berenicea) diluciana, 

 auct. 



Farther east, on the road from Pott on to St. Ives, about 

 3 50 yards south of the 6th milestone from St. Ives, I found a small 

 exposure of ' ironshot ' oolitic limestone and fragments of a hard 

 band full of Vermilia sulcata (?), containing also Ostrea gregaria 

 and a spine of Cidaris Smithii (?) Wright. Gryphcea and Exogyra 

 nana also occurred. North-west of here fragments of Els worth 

 Ilock were found at the surface, for some distance on the flank of 

 the high ground. 



To the south-east a valley runs west of the church at Pap worth 

 Everard. South-west of the church a good section of Els worth 

 Rock was seen for about 100 yards in the stream; at one point it 

 showed : — 



Boulder Clay. Inches. 



Havd, grey, ironshot, fossiliferous limestone, about 16 



Softer, marly, yellow- weathered limestone 10 



Hard, grey, ironshot limestone, with many fossils, seen for... 6 



The following specimens were obtained : — 



Ammonites {Cardioceras) excavatus (?) 

 Sow. 



A. (Perisphinctes) plieatilis, Sow. (abun- 

 dant). 



Phasianella striata (?) Sow. 



Fleurotomaria reticulata, Sow. 



Astarte my sis, Lor. & Pell. 



Exogyra nana, Sow. 



Gryph(Ba dilatata. Sow. (abundant). 



Lima rigida (?) Sow. 



Pecten fibrosus, Sow. 



Pholadomya csqualis (?) Sow. 



Pleuromya recurva (?) Phill. 



Vermilia sulcata (?) Sow. 



Reyond the intervening high ground to the north-easi, yellow 

 marl with fragments of oolitic Elsworth Rock is again seen in a 

 shallow valley along the north side of the grounds of Papworth 

 Hall. 



Thus, between Yelling and Papworth Hall four valleys 

 cut southward into the northern slope of the Drift-covered high 

 ground ; the Elsworth Rock is exposed in these valleys, and its outcrop 

 evidently loops northward in each case round the intervening 

 eminences, before striking southward under Drift in the neigh- 

 bourhood of Croxton. 



On crossing some high ground north of Papworth Everard, 

 yellow marl, with a few fragments of Elsworth Rock, was found 



