336 



J. F. BLAKE AND W. H. HUDLESTON ON 



of a soft and rather argillaceous stone (B of fig. 14), immediately un- 

 derlying the top block of workable freestone or true calc-grit. On 

 the east side, this bed, where well developed, is about 1 foot thick, 

 and in some places is a perfect mass of shells with hardly any matrix 

 at all. The species are for the most part the same as those in the 

 regular Trigonia-beda, but are smaller and in better condition. 

 The fossils we have obtained from these beds are : — 



Fossils of the TrigonisL-beds, Pickering. 



r, Belemnites subhastatus, Mont. 



Ammonites cordatus, Sow. (exca- 

 vatus, Sow.). 



vevtebralis, Sow. 



v.c. plicatilis, Sow. 



v.c. Chemnitzia keddingtoneusis, Sow. 

 v.c. Cerithium muricatum, Sow. 

 r. Littorina muricata, Sow. 

 c. Nerinaea visurgis, Bom. 



, species (imbricated). 



v.c. Exogyra nana, Sow. 



Ostrea solitaria, Sow., var. 



Anomia radiata, Phil. 



Plicatula, sp. 



Pecten fibrosus, Sow. 



qualicosta ? Et. 



r. Hinnites (small form). 



Lima elliptica, Whiteaves. 

 r. Avicula ovalis,P^. (peculiar form). 



c. Gervillia aviculoides, Sow. 

 c. Cucullsea corallina, Damon. 



Limopsis corallensis, Buv. 

 v.c. Trigonia perlata, Ag. (manyvars.). 

 r. Meriani, Ag. 



Cardium cyreniforme, Buvig. 

 v.c. Lucina Beanii, Lye. \ 

 v.c. aliena, Phil. J 



- oculus, Bl. <$f H. 



Corbicella, sp. 



Cyprina corallina, I)' Orb. 



Cypricardia glabra, Bl. <$[- H. 



Opis Pbilipsi, Morr. 

 c. Sowerbya triangularis, Phil, 

 v.r. Khynchonella lacunosa, Schlot. 

 r. Echinobrissus scutatus, Lam. 

 r. Cidaris Smithii, Wright (spine). 

 r. Khabdophyllia Phillipsi, M.-Edw. 

 (fragment). 



The division between this group and the next is drawn above the 

 uppermost continuous block of Calc-Grit, which in some places is 

 four feet thick, but splits up and changes rapidly. The latter is 

 represented by y in fig. 14. 



Fig. 14. — Enlarged Portion of Section at Pickering, Fig. 13. 



IMPURE LIMESTONES 



ft. in.1 «^ ^SHEL 



Lower part of g. 6 6 < C hiefly calcareous 



Upp er part of h. 



CHIEFLY CALC. GRITS 



