Vol. 52.] IN YORKSHIRE AND LINCOLNSHIRE. 203 



Section exposed by a slip in the quarried escarpment south of 

 Acre House Mine. 



Feet seen. 



[Striped pale and dark blue clay, slightly loamy, with pale 

 brown nodules with dark pyritous interior. Belemnites 

 jaculum (rather plentiful), Exogyra sinuata (large typical 

 form\ and other (undetermined) shells about 10 



/'Clay crowded with oolitic ferruginous grains. 



Claxby I B. lateralis (abundant) ; many bracliiopods about 1 



Iron- ■{ Slightly gritty oolitic ferruginous rubbly rock, crowded with 

 stone. I fossils. B. lateralis, Pecten cinctus, Exogyra sinuata (small 



( angular variety), etc about 7 



Spilsby ] Coarse greyish sand, indurated at the top, soft and inco- 

 Sandst. { herent below. B. lateralis, and casts of shells ... about 12 



In the lower part of the Tealby Clay in this locality I have not 

 been able to find any ammonites or other discriminative fossils 

 except Belemnites jaculum, and am therefore unable to decide what 

 portion of the extensive zone of B. jaculum is represented ; but from 

 the presence, at a slightly higher level, of forms which at Speeton 

 make their first appearance 50 or 60 feet above the base of the zone, 

 and from the absence of some characteristic species of the ' noricus- 

 beds ' (C 9, 10, & 11), I am inclined to think that not only in this 

 section but throughout Lincolnshire the lower portion of the zone is 

 absent, except for that small portion of it which may be represented 

 by the clayey band forming the top of the Ironstone. 



The unfortunate absence of sections prevents an accurate demar- 

 cation of the upward range of Belemnites lateralis farther south in 

 Lincolnshire; though at Donnington, as at Nettleton, its limit 

 must be at or about the top of the Ironstone, at which horizon 

 H. Keeping 1 records Amm. noricus {Hopl. regalis). At any rate, the 

 pit in Tealby Clay at the brickyard adjoining the railway-station 

 there, which seems to be very little above the top of the Ironstone, 

 yields no other belemnites except jaculum ; while the ammonites, 

 Olcostephanus (Simbirskites) umbonatus, Lahus., and cf. Payeri* 

 Toula, and other fossils found in it show that the horizon is at 

 least midway up in the Zone of B. jaculum (see p. 207). Nor, 

 so far as the scanty evidence tells, is there anywhere south of 

 this place any indication of B. lateralis in the clays above the Spilsby 

 Sandstone until we reach the southern extremity of the escarpment, 

 where just before the series disappears beneath the superficial 

 deposits of the Fenland, we find an important modification of the 

 conditions. 



In this neighbourhood, from 1 to 2 miles west of Spilsby, 

 there are outliers of clay on the Spilsby Sandstone, which at 

 Hundleby, and again at Marden Hill near East Keal, have been 

 extensively dug for brick-making. These clays have always been 

 mapped and recognized as part of the Tealby Clay, and must indeed 

 originally have been conterminous with that deposit ; yet they 

 contain B. lateralis and its accompanying fauna, from bottom to 



1 Quart. Journ. Geol. Soc. vol. xxxviii. (1882) p. 242. 

 . 2 See note, p. 207. 



