A. J. Jnltes-Browne — Red Chalk in Suffolk. 25 



here a band of red marly chalk is seen near the entrance, dipping 

 westward at a low angle, but soon becoming horizontal and running 

 along the whole face of the quarry, till it is cut off by a fault, which 

 brings up lower beds on the southern side. 



The complete section at the deepest part of the pit, not far from 

 the entrance, is as follows: — Feet. 



Soil and rubble of yellowish chalk 4 



Pink marly chalk, weathering into yellow rubble towards the out- 

 crop 3 



Hard nodular grey chalk 2\ 



Grey shaly chalk ... 2 



Very hard grey nodular and gritty chalk, containing large Ammo- 



7tites, Beleinnitella plena, and Terebratula semiglobosa 1 



Thin-bedded whitish chalk (C. ■ymcwto-w) 2J 



Hard greyish chalk 2 



Softer thin-bedded chalk (Rolaster subglobosics) 6 



Hard lumpy yellowish rock 0^ 



23i 



At the western end of the pit, where the red band is further from 

 the surface, the following is the section exposed : — 



Feet. 



Chalky soil 1 



Rough yellowish gritty chalk 4 



Eed marly chalk, brick-red at the top, pink below, and passing 



down into grey marly chalk with hard lumps 5 



Hard grey rocky and nodular chalk 2 



Soft grey shaly chalk, seen for 1 



13 



The red chalk breaks into small angular blocks, the edges of which 

 are pinkish white, and all the joint-planes are bordered by whitish 

 bands, about a third of an inch thick ; facts which seem to indicate that 

 the percolation of M'ater from the surface has effected a certain amount 

 of decoloration, and that the whole was originally of one uniform colour, 

 darkest at the top, and becoming lighter in tint towards the base. 



With regard to the stratigraphical position of these beds, we ascer- 

 tained that the quarry lies between the outcrops of the Totternhoe Stone 

 and the Melbourn Rock, and is opened in a shallow synclinal trough, 

 so that there must be an anticlinal to the east of the pit and a 

 second outcrop of the red chalk with an easterly dip along a line 

 nearer to Mildenhall, but of this no indication was found. The 

 Totternhoe Stone is found at Isleham, and traces of it occur near 

 West Row, about three-quarters of a mile N.W. of the "red chalk 

 quarry "; the Melbourn Rock is seen between Worlington and Milden- 

 hall, and its outcrop appears to run round Mildenhall at a distance of 

 about a mile and a half from West Row Ferry. Solaster suhglohosus 

 is found in the lower part of the section at West Row, and the occur- 

 rence of typical Bdemnitella plena points to a high horizon in that 

 zone ; the existence of this Belemnite here is indeed an interesting and 

 noteworthy fact, for the typical forms have never yet been found in 

 •Suffolk or Cambridge, except at the very summit of the Lower Chalk, 

 From the red chalk itself we obtained no fossils. It is clear, therefore, 

 that the horizon of the red band is about the centre of the zone of 



