232 
Proceedings of the Royal Irish Academy. 
Bed No. 8. . . Great bed of hard brownish-grey crystalline dolomite, extremely 
fissured and weather-worn where exposed, intimately^^associ- 
ated with the zinc deposits of the province. 
„ No. 9. . . Dull-grey non-crystalline limestone, also much fissured, contain- 
ing extensive deposits of white hydrated silicates and carbonates 
of zinc, and a gx'eat variety of hydrated clays. In some points 
it presents compact beds of large oysters, and in it occurred the 
remarkable deposit of hydrosilicate and carbonate of zinc, en- 
closing bones of quaternary animals partially altered into 
phosphate of zinc. 
„ No. 10. . . Bed of dark blueish-black limestone, which forms the bases of 
No. 9. It furnishes a cement of a rich light cream-yellow 
colour ; is nearly yellow after calcination, and of a first-rate 
quality. 
No. 11. . . Beds of slate clay and greenish sandstone, often very micaceous. 
,, No. 12. . . Thick beds of light-grey compact lithographic limestone, contain- 
ing deposits of hydrocarbonates and silicates of zinc. They 
are much broken up by jointing, and eroded into cavities or 
caves. It contains a great abundance of fossils. 
,, No. 13. . . Beds of marly clays, red sandstones, and thin limestones, the red 
predominating, and being associated with gypsum and salt in 
the Valley of Cabazon de la Sal. 
The numbers in the enlarged section represent the corresponding rocks of the 
smaller one. 
