202 



MESSES. P. P. KENDALL AND K. G. BELL ON 



do not seem to be known, either in a fossil or recent state ; of these, 

 some few were named by the late Mr. Wood in MS., atid, as such, 

 have been included in the synoptical list of Mollusca appended ; but 

 the authors have thought it better to postpone the naming and de- 

 scription of any other new species until further specimens have been 

 collected. 



The various deposits are to ' be seen in a sand and clay pit exca- 

 vated upon the K.W. slope of the hill upon which stands the vicarage 

 of St. Erth, and at an altitude of 100 feet above 0. D. Other 

 exposures will be mentioned in the sequel. 



The succession of the beds is shown in the section subjoined 

 (fig- 1). 



Fig. 1. — Section at St. Erth. 



^^&:^^ 



*\x A}*aV'"'^ V V" '■\\ I'ine quartzose sand. 



Vegetable soil. 

 " Head." 



Yellow sand, 



" Growder." 

 Yellow clay. 



Blue clay, with fossils. 

 Quartz-pebbles. 







>- 



A^. 



A -A 'v 



" Growder." 

 Elvan Dyke. 



The Bed 1, or "Head," is an argillaceous deposit containing many 

 angular fragments of killas and other local rocks, and is probably 

 of glacial origin. Mr. S. Y. Wood identilies it with the " warp " of 

 his memoir on the " IN'ewer Pliocene Pormation " ; below this comes 

 the series of beds with which we purpose dealing. 



Bed 2 is composed of fine yellow sand, which is well exposed 

 upon the N.E. face of the pit. 



Bed 3, yellow clay without fossils, separated from " 2 " by a thin 

 layer of very coarse ferruginous quartzose sand (" Growder"). 



Bed 4. Blue Clay, with many fossils. 



Bed 5. Layer of scattered quartzose pebbles. 



Bed 6. Fine quartzose sand, yellow above and purplish below. 



Bed 7. Very coarse highly ferruginous sand (" Growder "). 



