204 MR. G. W. LAMPLUGH OS THE SPEETON SERIES [May 1 896, 



top as far as exposed, and must therefore be considered along with 

 the Spilsby Sandstone and the Claxby Ironstone as forming, for 

 palaeontological purposes, the ' Zone of Belemnites lateralis? The 

 sections afforded by these pits are as follows : — 



Section at the western end of Hundleby Brickyard. 



Feet. 



Ferruginous gritty clay, partly indurated and nodular, -with a 

 few obscure fossils ; rather like the Carstone in appearance. 3 



Striped gritty clay 4 



Band of irregular, round, brown, ferruginous nodules. Am- 

 monites, cf. gravesiformis, etc. 



Striped pale- and dark-blue gritty clay 5 



Band of large pale-brown nodules. 



Blue pyritous clay with pale sandy streaks, and flat pyritous 

 nodules full of coarse grit. Belemnites lateralis ; small 

 crushed ammonites ; wood perforated by boring-shells, etc. . 5 



Section at the south-western corner of Marden Hill 

 {East Keal) Brickyard. 



Feet. 

 Red clayey soil and drift, with fragments of chalk and flint. 



about 3 

 Weathered banded clay, brown, pyritous, and silty, with slightly 

 ferruginous layers and sandy streaks, and a gritty seam at 



the base about 4 



Silty blue clay with sandy streaks and ferruginous layers 5 



Fossiliferous seam, with Belemnites lateralis, small crushed 



ammonites (Olcostephanus), and many small univalve and 



bivalve shells. 



Clay as above, rather more gritty, with coarse grit-grains in 



flat pyritous nodules. B. lateralis and other fossils as above. 



in places 17 



Floor of lumpy ferruginous stone, like coalescent nodules, 

 slightly gritty, and full of oolitic ferruginous grains. Many 

 casts of fossils. Ammonites {Olcostephanus), cf. gravesi- 

 formis, etc., Trigonia, Astarte, etc. 



The fossils of these pits are practically identical. At Hundleby, 

 though the un worked condition of the section at the time of 

 my examination of it, in 1893 and again in 1895, was unfa- 

 vourable for collecting fossils in place, I found fragments of 

 Belemnites lateralis scattered in all parts of the pit, unmixed with 

 any other form of the genus. I found also clay-stone casts of the 

 deep umbilicus of ' coronated ' ammonites akin to Olcostephanus 

 (Polyptychites) gravesiformis, Pavl. ( = Ammonites Irius, d'Orb., of 

 Judd), exactly as they occur in bed D3 at Speeton, together with 

 some smaller specimens of the same group, 0. (P.) cf. Keyserlingi 

 and cf. gravesiformis (which are evidently the forms referred in 

 the Geol. Surv. Mem. to A. speetonensis), and several brachiopods 

 and lamellibranchs present in the Claxby Ironstone. 



At Marden Hill on my last visit the section was quite fresh 

 in one part of the pit, and here I obtained Belemnites lateralis in 

 the clay within 9 feet of the top, and at lower levels down to the 

 base of the pit, but found no trace of any other belemnite. Small 



