196 THE GEOLOGICAL STRUCTUEE OF THE 



ft. ins. ft. ins. 



a 



' AALE^'SI3 25. Blue, compact, argillaceous lime- 

 stone. Grammoceras suhcomp- 

 tnm ; numerous Lamellibranehs 

 and Gasteropods indetermin- 

 able; easts of Cucullaa, sp., 

 Inoccramus, Amherleya, sp. ... 3 



I DuMORTiERi-i: 2G. Greenish-blue clay, measured by 

 the level and reckoned to be in 

 all 50 



Excavation made lower down the 

 hill by the roadside. 



DisPANsi 27. Pinkish to grey, dense, earthy 

 limestone — a few large iron 

 specks. Grammoceras fallaci- 

 osum 4 



Striatult. 28. Greenish-grey, earthy limestone, 

 coarsely ironshot. G.striatulum, 

 Pectens, Belemnites 2 



BiFRONTis. 20. Blue, argillaceous limestone, irre- 



gularly specked, with large iron 

 grains. Hildoceras bifrous, Be- 

 lemnites. PJiynchonella sp. ... 2 



Falciferi. 30. Pinkish argillaceous limestone, 



very few iron grains. Harpo- 

 ceras falciferum, Dactylioceras 



\ commune 2 



PLiEXsr.ACHiAN ^ Age. 31. Grecnish-blue clay visible 7 



Beginning at the base, the first point to notice is the 

 absence of the Marlstone, a deposit of the Spinati hemera — a 

 fact also further confirmed for the western part of the hill 

 by excavations at Elwell Spring giving the same result. As 

 will be seen in later sections, the Marlstone is found in other 

 portions of Dundry Hill interj^osed between beds 30 and 31, 

 i.e. between the Pliensbachian clays and the beds of the 

 Toarcian Age. 



Next, the thin deposits (Xos. 27-30), yielding the same 

 species of ammonites as the base of the " Cephalopod-bed " 



^ To replace Charmouthian, see note, p. 232. 



