OE THE TJPPEE CKETACEOTJS IN WEST SUEEOLK AND NOBEOLK. 565 



find along the eastern side of this fen are above the horizon of the 

 rock ; thus an old pit by the side of the main road, five furlongs 

 S.E. of Eriswell Church, shows chalk with many fragments of Ino- 

 ceramus mytiloides ; this we regard as high up in the zone and 

 consequently at some 30 feet above the base of the rock ; the pit 

 itself may be about 25 feet above the level of the fen, so that the 

 outcrop of the rock is probably just at the edge of the fen near 

 Eriswell, a position which it appears to hold for some distance 

 northward, as far as Lakenheath. 



The lowest exposure we could find near Eriswell was in a small 

 pit about a mile north of that place, where we found hard chalk 

 containing Rhynchonella Cuvieri and Inoceramus mytiloides ; this 

 cannot be far above the Rock. Beyond this the country is deeply 

 covered with blown sand. 



At Lakenheath, north-east of the church, there is an extensive 

 quarry exposing about 30 feet of hard lumpy or nodular chalk 

 which clearly belongs to the zone of Rliynclionella Cuvieri. It bears 

 a striking resemblance to the chalk of the same zone exposed in the 

 quarry and rail-cutting north of Goring in the valley of the Thames ; 

 the weathered faces present a rubbly appearance with large lumps 

 of harder rock standing out here and there, but not forming any 

 continuous bed ; Echinoconus subrotundus was fairly common, but 

 other fossils were not abundant except at the lowest level near the 

 entrance, where harder and more regularly bedded nodular yellowish 

 chalk is exposed, full of Inoceramus mytiloides, and like that which 

 always overlies the Melbourn Rock. The workmen informed us 

 that a few feet below the floor of this excavation they were stopped 

 by water, so that here the rock appears to be below the level of the 

 adjacent fenland, which is only about 300 yards from the entrance 

 to the quarry. 



More than two miles N.N.E. of Lakenheath and a little way 

 south east of the railway-station there is a small pit close to the 

 edge of the fen, which we did not visit, but in which Mr. Whitaker 

 subsequently found Inoceramus mytiloides and Echinoconus sub- 

 rotundus, so that it is doubtless in the same beds as the large quarry 

 at Lakenheath. 



Crossing the alluvium of the Brandon river we find ourselves on 

 Lower Chalk, as already mentioned ; and though the ridge above 

 Hockwold is doubtless partly due to the outcrop of the Melbourn 

 Rock, we could not discover any actual evidence of its existence, 

 the only quarry near Hockwold (three furlongs north of the church) 

 being in Grey Chalk. 



On the Feltwell side this ridge sinks down into an undulating 

 plateau, the natural features of which are masked by a drift of blown 

 sand, and no pits have been opened along the course of the zone we 

 have been following ; but at Eeltwell St. Mary, in a dry pond by 

 the roadside, a quarter of a mile ISLE, of the church, we found a 

 small exposure of pink chalk weathering yellow and exactly like 

 that of West Row ; below it was a course of very hard nodular rock 

 overlying soft whitish chalk, so that the agreement between the 



