346 ME. W. HILL 0]S" THE LOWEE BEDS OE THE UPPER 



(C.) Zone of Belemnitella plena. 



It remains to indicate briefly the evidence of the continuation of 

 the Belemnite-marls. 



Besides the fact that there is a band of laminated marl, almost 

 black in the centre, greyer at the top and bottom, and in all respects 

 similar to the band in which the fossil Belemnitella plena occurs just 

 on the other side of the Humber, no other information can be ob- 

 tained from the Greystones pit. 



Pull details of this horizon of the Chalk, as seen in the cutting of 

 the railway to the east of South Cave, have been given on p. 339, 

 the section being an almost exact repetition of that at Barton-on- 

 Humber. 



The " dark shaly band " at the top of the Grey Chalk is seen just 

 " at the angle of the road " leading from South Newbald to the 

 Wolds *. 



A pit a mile and a half south-east of Londesboro', near a road 

 leading from Towthorpe corner to Easthorpe, shows a fair section of 

 the chalk at this horizon as follows : — 



ft. in. 

 ^Soil and rubble , 1 6 



Eather thin-bedded platy chalk, hard and 



whitish, flints 3 



Middle , Massively bedded chalk, creamy white, divi- 



Chalk. ' ded into courses by thin marly bands 6 6 



Hardish, smooth, white chalk 10 in. to 1 ft, 



A marked marl band 3 inches. 



^ Hard, smooth, creamy chalk 2 



Zone of I Softer, marly, creamy yellow chalk 1 6 





Zone of I *^"^'''=-'^' many, creamy yeuow cnaijs i 



Bel. pleoia \ ^^^^ sbaly marl, darkest in the centre, 



■^ '1 graduating into the bed below 1 



Grey /Rubbly nodular chalk, nodules separated by 

 \, Chalk. 1 marl 1 



The presence of the Belemnite-marls has been noted at Park Earm 

 (p. 340), but between this point and Speeton I know only of two 

 exposures where they can be seen. The first is in Earthquake 

 plantation, | mile south-west of Wharram Grange, and the second 

 by the Glebe Earm near Heslerton. In neither place do they occupy 

 the original position of their outcrop, and no idea can be formed as 

 to the sequence of the beds above and below. The marls have been 

 seen by Mr. Mortimer very near Wharram Station f. 



In the Speeton Cliffs they are seen again occupying the same 

 relative position to the beds above and below them. The section 

 from the first line of flints to the top of bed 6 is given on page 345. 

 The marls here enclose a lenticular band of hard white chalk, as 

 frequently the case in Hertfordshire and Cambridgeshire. 



* " Geol. York and Hull," Mem. Geol. Survey, p. 29. 

 t " Geol. of Driffield," Mem. Geol. Survey, p. 9. 



