TABLE OF CONTENTS.
 

CHAPTER I.

Introduction.
 

Page
A Glance at the probable Earliest Condition of the Earth.—Stratified Crystalline

Rocks resulting from Changes of Sedimentary Deposits.—The Silurian System

established and extended.—The Laurentian the Base of Palgeozoic Rocks in

Britain and elsewhere.—The Eozoon.—General Palteozoic Succession    .        .      1
 

CHAPTER II.

Cambrian Rocks.

Outlines, Structure, and Order of the Rocks next above the Laurentian.—The Rare
Fossils of the Cambrian Rocks.—The Order of Conformable Succession upward
to the ' Primordial,' or Lowest Silurian, Zone.—Slaty Cleavage.—Metamor¬
phosed Cambrian Rocks of Anglesea........21
 

I ;                                       CHAPTER III.

Lower Silurian Rocks.

Kscending Order of the Strata from beneath the Stiper Stones to the Llandeilo
' Flags of Shelve, in the'original Typical Tract of the Silurian Region.—Similar
i' Order of Strata in Wales from the Lingula-flags upwards.—The Llandeilo
Rocks and their Fossils as exhibited in Shropshire.—The Range of the same
Formation with its characteristic Fossils through Wales.—Distinction be¬
tween the Llandeilo and Caradoc Formations by Infraposition and by Fossils.
—Graptolites exclusively Silurian          .        •......37

CHAPTER lY.

Lower Silurian Rocks {continued).

The Caradoc Formation.—Shelly Sandstones of Caer Caradoc.—General Cha¬
racter and Order in the typical Silurian Tract of Shropshire.—Chief Organic
Remains as distinguished from those of the Llandeilo Formation.—Great
Masses of the Slaty Rocks of Wales, in chiding the Bala Limestone, shown to
be the Equivalents of the Caradoc of Shropshire.—Igneous Rocks, Cotem-
poraneous and Eruptive, of Lower Silurian age......63