A. E. Trueman — The Lias of South Lincolnshire. 107 



the sub-zones from Jihidatum upwards being absent. This supports 

 the conclusion of W. H. Dalton.' 



B. Grantham. 



It is useful to compare the sections described above with those in 

 the neighbourhood of Grranthara. The junction with the overlying 

 ironstone is exposed at the waterworks at Saltersford about one 

 raile south of Grantham, where an extensive collection of fossils 

 from the excavations was made by Mr. H. Preston, F.G.S., who 

 generously placed his notes and specimens at my disposal. Much of 

 the remainder of the Upper Lias is exposed in Rudd's Brick Yard, 

 several hundred yards west of the railway station, while the Middle 

 Lias may be seen in the brick-pits at Gonerby. The general section 

 may thus be taken as follows : — 



fibulatum 



sub zone. 



? 23 ft. 



siibcarinatum 



sub-zone. 



51ft. 



;pseudovatum- 



falciferum. 



sub-zone. 



9 ft. 6 in. 



exaratuvi 



sub-zone. 



15 ft. 



ienuicostatum 

 sub-zone. 



15 ft. 



acutum 



sub-zone. 



spinatiim 



zone. 35 ft. 



Micaceous shale, grey, iron-stained, unfossiliferous . 



Grey shales with Pseudolioceras cf. lythense, 

 Porpoceras vortex, P. aff. verticosimi, Hildoceras 

 bifrons, H. hildense, Phylloceras cf . heterophyllum, 

 Peronoceras cf. attenuatum. Leda ovum very 

 abundant in pocket=. ( = Lower Leda ovum Beds 

 of Northamptonshire) ...... 



Grey shales with scattered nodules. Hildoceras 

 bifrons, Dactylioceras coinmune, D. cf. cBg_ui- 

 striatum, D. hollandrei, Cceloceras crasstim . 



Dark earthy limestone. Hildoceras bifrons, Dactylio- 

 ceras coinmune, Frechiella subcarinata 



Grey shale with scattered nodules. Dactyloids 

 abundant in nodules. In the lower part, Harpoceras 

 aff. mulgravium occurs ..... 



Oolite Bed. Bubbly ferruginous limestone and clay 

 with scattered Oolite grains. Many fossils. 

 Harpoceratoides ovatum, Y. & B., in upper part. 

 Harpoceras aii. falcifer, H. mulgravium, H. 

 ? strangivaysi, Dactylioceras gracile, D. acantJms, 

 Cceloceras aff. fonticulum, Onustus sp., Nucula 

 hammeri ....... 



Grey shale with nodules, Harpoceras aff. falcifer 

 Dactylioceras spp. , Cmloceras aff. fonticulum 



Grey shales with blue limestone nodules, containing 

 well-preserved ammonites at all stages of growth 

 H. aff. exaratum, Elegantuliceras elegantulum 

 Dactylioceras vermis, Inoceramus 



Paper shales with flattened nodules ; fish scales and 

 insect remains ...... 



ft. 

 18 



Unknown. Junction of Middle and Upper Lias not 

 exposed 



Marlstone ironstone, with Rhynclwnella tetrahedra 

 and Terebratulct punctata . . . about 20 



Micaceous clay with beds of rubbly ferruginous stone, 

 yellow sandy layers containing many bivalves, and 

 large ironstone septaria, Pholadomya sp., CticuUea 

 sp., Paltopleuroceras spp. . . . . .15 



5 



30 



1 



20 



9 



15 



15 



^ Loc. cit. 



