XII. Memoir on the Geological Relations of the East of Ireland . 
By THOMAS WEAVER, Esq. 
M.R.I.A. M.W.S. M.R.H. & H.D.S. 
[Read 15th May, 1818.} 
Contents . 
2. MICA SLATE. 
Eastern Division . — Its extent, struc- 
ture, position ; contact with other 
rocks ; interstratified with granite, 
quartz, talc slate, and trap ro6ks ; 
traversed by contemporaneous veins; 
minerals contained in it, § 21 to § 38. 
Western Division — Extent ; inter- 
rupted; bounded by other rocks; in 
caps ; interstratified with granite, 
quartz, trap, and porphyry; contains 
discontinuous beds and veins of granite 
and quartz ; minerals imbedded in it, 
§ 39 to § 50. 
3. CLAY SLATE- 
Western Division. — Extent; posi- 
tion ; interstratified with trap and por- 
phyry; with clay slate conglomerate, 
I. granite. greywacke, and greywacke slate, and 
with granite, § 51 to 55. 
Bounded by other rocks ; its extent ; 
structure ; minerals found in it ; con- Eastern Division. — Extent ; posi- 
temporaneous veins; stratified, § 15 tion; surrounds isolated portions of 
to § 20. the fundamental granite ; interstrati- 
INTRODUCTION, * 1 to § 4. 
FORM OF SURFACE. 
General view of the Limestone 
Plain ; Mountain Groups ; Eastern, 
Southern, Western, Central, and North- 
ern Mountains and Hilly Tracts ; Ele- 
vation of these respectively, § 5 to § 10. 
GEOLOGICAL RELATION. 
General distribution of the subject, 
§ 11 . 
I. Primary Tracts. 
Eastern mountain chain; general 
structure, § 12 to § 14. 
