NVIHSIAlOa 



NVID3IMH 



The accompanying 

 diagram (fig. A) shows 

 the famial sequences, 

 and non-sequences, in 

 the Domerian and 

 Hwiccian of the areas 

 under consideration. 

 ISTo account is taken 

 of the thicknesses of 

 strata ; it is only a 

 fauna! record; but it 

 becomes a stratigra- 

 phical illustration of 

 the position of affairs 

 when the concluding 

 strata of the Domerian 

 w^ere deposited. 



The datum-line is 

 7 Domerian {spina- 

 tuni) proved in all 

 areas. 



The movement of 

 the Men dip axis of 

 North Somerset is 

 quite obvious. Its 

 influence apparently 

 extended to Grlouces- 

 •tershire. On the Dor- 

 set Coast, though the 

 Domerian strata are 

 especially thick, there 

 are two more non- 

 sequences, due possibly 

 to movement of the 

 ^"Ve^anouth anticline. 

 The last of these, the 

 pre - sp inci f u m one, 

 which presumably co- 

 incides mth the lack 

 of the IcBvU zone of 

 Raasay, is particularly 

 interesting. The base 

 of spinafum has Blue 

 Lias pebbles, the date 

 of which it would be 

 interesting to deter- 

 mine. If, as lias been 

 supposed, the pebbles 

 are from early Dome- 

 rian beds,^ which 

 happen to be about 



1 Q. J. G. S. vol. Ixvi 

 (1910) p. 82. 



