Edward T. Sardman — On Hcematlte in Tyrone. 401 



Fig. I.— sketch SECTION, 



To show mode of occurrence of the Haematite deposit in the Carboniferous 

 Limestone Beds near Cookstown, Co. Tyrone. 



Stream. 



Trial Old 

 Pit. Workings, 



Long-itudinal Scale, twelve inches to one mile. 

 Vertical Scale, about 240 feet to one inch. 

 Thickness of beds much exaggerated. 



(Details of Section will be found at p. 396.) 



Fig. 2. Fig. 3. 



About half the natural size. 



Fig. 2. — Hollow nodule of brown Hematite from shale beds 

 near Cookstown. 

 [a) Shell of compact Haematite. 

 {b) Internal coating of mammillated fibrous brown Haematite. 



Fig. 3. — Nodule of Ironstone from later Tertiary beds of Lough 

 Neagh ; partially altered. 

 [a) Original Clay-ironstone forming interior nucleus. 

 {b) Shell of pseudomorphic brown Hsematite consequent on 

 decomposition of [a). 



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