Vll 
TABLE OF CONTENTS. 
PAOIC 
PKEFACE, BY THE DIRECTOR-GENERAL - - iii 
CHAPTER I. 
INTRODUCTION - ... 1 
The term Jurassic Extent of the Jurassic Bocks in Britain 
Kelations of the Rocks to the Formations above and below - 1 
Progress of knowledge concerning the Jurassic Bocks Re- 
searches of William Smith - - - 1 
Table showing the Subdivisions of the Jurassic Rocks accord- 
ing to William Smith - 
Subdivisions of the Jurassic Rocks - - 6 
Table showing the principal Subdivisions of the Jurassic Rocks 
from Dorsetshire to Lincolnshire 
Sequence of rocks and Passage-beds Planes of demarcation - 7 
Lateral changes in Formations Stratigraphical and Pala?onto- 
logical Subdivisions .... - 10 
Sections of the Strata 
Fauna and Flora - ..... 
Preservation of Fossils - - - - 16 
Characteristic Fossils Fossil-beds Zones - - 17 
CHAPTER II. 
THE LIAS - 21 
GENERAL ACCOUNT OF THE STKATA ... - 21 
Organic Remains - - - - - - 24 
Zones - - - - - - - 25 
Formation of the Rocks - - - 27 
Microscopic Structure - - - - - - 32 
Subdivisions of the Lias ... - 33 
Table showing the principal Zones in the Liassic Rocks - 34 
LOWER LIAS : 
GENERAL DESCRIPTION - - 
Zones - - - - - 36 
Organic Remains - ... 37 
Characteristic Fossils - - - - - - 45 
CHAPTER III. 
LOWER LIAS (continued) : 
LOCAL DETAILS : 
Dorsetshire coast - - - - 54 
Inland sections, Dorsetshire and Devonshire to Mem bury and 
Chard - 72 
Vale of Taunton to llminster 
Vale of Ilchester and the Polden Hills - 
Shepton Mallet, Wells, and Uphill 
West Somerset .... 
Mendip Hills 
CHAPTER IV. 
LOWER LIAS (continued) : 
LOCAL DETAILS : 
Glamorganshire and Monmouthshire 
74 
76 
85 
91 
97 
