OF THE UPPER CRETACEOUS IN WEST SUFFOLK AND NORFOLK. 551 



of the cores showed that hard material had been passed through, 

 probably at the top of the blue Gault. Belemnites were found in 

 the cores, and also in the lowest part of the hard Chalk-marl, but 

 not higher. 



About half a mile IST.E. of Grimston-Road Station the following 

 succession of beds, having a slight dip to the east, is shown in a 

 shallow cutting of the railway. Entering from the southern end, a 

 dark-grey calcareous clay is seen for about fifty yards. Some thirty 

 yards south of the bridge which spans the centre of the cutting this 

 clay is seen to be overlain by a bed of hard, bluish-grey rock, eight 

 or ten inches thick. Two feet above this bed, and extending for 

 almost the entire length of the cutting from this point to the north, 

 rather more than a foot of the clay is coloured a bright reddish 

 pink. This band is divided in places by uncoloured material. 

 North of the bridge, a second bed of pale yellowish-grey rock, about 

 eight inches thick, is seen above the red band, separated from it by 

 a few inches of marly clay. The lower of these hard beds proved 

 fossiliferous, the most abundant form being Inoceramus concentricus ; 

 associated with it were Inoceramus sulcatus, Ammonites lautus, and 

 A. rostratus. The upper bed appeared to contain few fossils. 

 Inoc. concentricus occurred sparingly. 



The succession of these beds was further confirmed by following 

 the course of the brook to the west of Grimston Church. The out- 

 crop of the lower hard bed occurs just by a small field-bridge about 

 a quarter of a mile S.W. of the church. It is easily identified by 

 its fossils, which are the same as those from this bed in the cutting. 

 Following upward the course of the stream, a grey marly clay is 

 exposed on either bank, which, just above the hard bed, and rather 

 closer to it than in the cutting, is tinged with pink. Above this is 

 a second hard bed. At the confluence with the main brook of a 

 small stream, which takes its rise immediately to the west of the 

 church, hard, creamy-white Chalk-marl is seen, bared at this point 

 from all sediment by the swiftly running water. This spring 

 appears to rise at the horizon of the hard grey chalk noted at the 

 Roy don pit, with which the material from the spring-head agrees. 

 Belemnites occur from the lower hard bed to the Chalk-marl, very 

 abundantly in the pink, more sparingly above it. 



About a mile to the south-west, the same order of succession of 

 these beds can be made out in the channel cut by the water rising from 

 the Sow's Head spring. The water here appears to come out at the 

 base of the hard Chalk-marl, for hard limestone, weathering yellowish 

 and containing Belemnites, extends for some little distance down 

 stream. Below this, with about the same interval of grey marly 

 clay between them as at Grimston, are two hard beds, the lower 

 containing the same fossils as before ; and the marl above it being 

 tinted a dull brownish pink, is probably the representative of the 

 red band in the cutting. 



There is perhaps some ground for doubting whether the hard 

 beds seen in this neighbourhood occur continuously at the same 

 horizon ; for Mr. Eose notes a hard bed at Pentney only 2 feet 



