92 
Geology of Wiitshire. 
dence they divide the whole series of stratified rocks chronologi- 
cally, into the following groups, beginning with the oldest, that is 
the lowest in the series. 
TABULAR View OF FossILIFEROUS STRATA. 
1. The Cambrian, 
2. The Silurian, 
3. The Devonian, 
(or old red sand- 
stone.) 
4. The Carboniferous, 
5. Permian, or Mag- 
nesian limestone 
6. Trias, (formerly 
called New Red 
Sandstone.) 
7. Lias, 
Primary (i.e. earlier) Fossiliferous Strata. 
8. Oolite, or Jur- 
assic system. 
Secondary F’. Strat. 
divided into 1. 
consisting in Britain of the slates, flags, 
grits, and limestones of North Wales. 
Slates of Scotland; limestones and black 
slate of Bala; shales, sandstones, and 
limestones of Shropshire. 
Slates of Caithness, sandstones of Fife, 
Elgin, and Arbroath in Scotland, of 
Devonshire in England. 
Sandstones and limestones, containing 
beds of coal, in England and Scotland, 
and including the mountain limestone. 
Limestones of Durham and Yorkshire, 
and sandstones of North of England. 
Limestone and shales of Cheshire and 
Lancashire. 
Blue limestone and marlstones of So- 
merset and Gloucestershire, &ce. 
Lower oolite. 
2. Upper or great oolite. 
3. Oxford clay and Coral rag. 
4, Kimmeridge clay. 
5. Portland stone and sands. 
6. Purbeck beds. 
9. Cretaceous System,—divided into 
1. Wealden. 
2. Lower green sand or ‘ Neo- 
comean.’ 
3. Gault. 
. Upper green sand. 
5. Lower and upper chalk. 
i 
