370 



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



Ammonites plicatilis is rather common in this quarry; and towards 

 the top, although there is no regular Coral Kag, a few Montlivaltice 

 are noticed. On the whole, therefore, the stratigraphical evidence 

 is rather in favour of placing Sike-Gate quarry in the Kag subdi- 

 vision ; and the workmen themselves believe that " soft stone " lies 

 underneath. 



Fig. 20. — Section of Sike-Gate Quarry on Cawton Heights. 



1 & 3. Broken Oolites. 

 5. A less fractured Oolite. 

 2, 4, 6. Brasby partings. 



7. Strong blocks of bluisb-grey limestone with yellowish ova. 



8. A smaller bed with many Ammonites. 



The upper portions, 1-6, constitute one subdivision, and are re- 

 markable for the number of urchins. Collyrites bicordatus (large 

 form, similar to the one at Hildenley and North Grimston) occurs. 

 Holectypus depressus and Echinobrissus scutatus are very plentiful; 

 spines of Hemicidaris intermedia not uncommon, and more rarely 

 Pseudodiadema hemisphoirieum. Spines of Cidaris Jlori gemma were 

 observed in stone piled up by the side of the kiln. In these beds 

 also occur Pholadomy a wqualist \Myacites recurva ,Goniomya v-scripta, 

 and in the brash at the bottom, No. 6, occasional specimens of Amm. 

 plicatilis. The lower hard band contains many univalves — Natica 

 clio or corallina, Littorina pulclierrima, i)ollf., and Chemnitzia, sp. 

 Lncina aspera, Buvig., a shell generally indicative of a high position, 

 is also very abundant ; and in the lowest bed of all are many speci- 

 mens of Ammonites plicatilis, and of A. cordatus and A. vertebralis f 

 presenting singular varieties, of which we have figured one as A. 

 cawtonensis. The rest of the fossils obtained from this quarry, but 

 the exact position not noted, are : — 



Belemnites abbreviates, Mill. 

 Ammonites, sp. (cf. perarmatus) (re- 

 markable form). 

 Purpuroidea nodulata, Y. $• B. 

 Pleurotomaria reticulata, Sow. 

 Exogyra nana, Sow. 

 Grypbcea dilatata, Sow. 

 Pecten, sp. 

 vimineus, Sow. 



Lima rigida, Sow. 



Modiola suba^quiplicata, Goldf. 



Trigonia (narrow costate form). 



Astarte ovata, Smith. 



Protocardium isocardioides, Bl. $ H. 



Goniomya literata, Sow. 



Terebratula insignis, Schiib. 



Pygaster umbrella, Ay. 



Clypeus or Pygurus, sp. 



