118 
Mr. Weaver on the 
fied with granite, with quartz rock, 
greywacke, ' grey wacke slate, trap, and 
porphyry ; note on basalt ; mutual re- 
lations of clay slate and quartz rock 
with hornstone and flinty slate, and 
with grey wacke and grey wacke slate ; 
inflections of strata; general view of 
the stratified structure ; distribution of 
metals through rocks; application of 
the term transition , ^ 56 to § 88. 
METALLIFEROUS RELATIONS OF THE 
EASTERN MOUNTAIN CHAIN. 
Total absence of metals on the west- 
ern side of the granite chain; abun- 
dant on the eastern; marked distinc- 
tion between the mineral repositories 
in the granite and mica slate tracts, 
and those of the clay slate tract, § 89. 
1. METALLIFEROUS RELATIONS OF 
THE GRANITE AND MICA SLATE 
TRACTS. 
History of the veins discovered, and 
wrought ; only one instance of a metal- 
liferous bed, § 90 to § 102. 
2. METALLIFEROUS RELATIONS OF 
THE CLAY SLATE TRACT. 
Eleven metals found in it; extent of 
the metalliferous repositories ; some 
alluvial ; the others consist only of 
beds, or contemporaneous veins ; history 
of the operations at Croghan Kinshela; 
at Croghan Moira; history of the me- 
tallic relations in the district of Crone- 
bane ; Ballygahan ; Ballymurtagh ; 
county of Wexford, § 103 to 118. 
II. Transition Tracts. 
Extent ; connected with the floetz 
limestone formation ; proposed detailed 
description of the coast of the county 
of Dublin ; the transition rocks con- 
sist of clay slate, clay slate conglome- 
rate, grey wacke, and grey wacke slate, 
interstrati fied with limestone, lime- 
stone conglomerate, trap, and porphyry, 
§ 119 to § 121. 
Description of, 
1. Portrane Head Land, § 122, 123. 
2. Isle of Lambay, § 124. 
3. Coast of the county of Dublin, from 
the north of Balbriggan to the 
south of Skerries, § 123 to § 128. 
4. Islands of St. Patrick, Count, She- 
nex, and Rockabill, § 129, 130. 
Boundaries of the transition tracts, 
§ 131. 
Metalliferous relations, § 132. 
III. Floetz Tracts, 
I. OLD, OR FIRST FLOETZ SANDSTONE. 
Distribution ; relative position, ^ 134. 
Description of, 
1. Dunabate, 1 , ,or 
2. Hill of Lyons, I35 ‘ 
Scattered debris, § 136. 
3. Red Hill and Leap of Allen, with 
general notices of this range, 
I 137. 
4. Sleeve Bloom, and Bilboa Moun- 
tains, with general notices of these 
ranges, and of their metalliferous 
relations, § 138 to 141. 
5. Tracts bordering on the Shannon, 
§ 142. 
6. Gaultees Mountain Chain, and 
Slievenamuck, § 143. 
