THE PICTOU COAL FIELD — POOLE. 8o9 



separate. In a small way several beds have been used for mak- 

 ing- ground clay and even for firebrick, in some cases promising 

 success, as for instance, a bed underlying the McGregor seam. In 

 other cases as the thick bed immediately overlying the Deep seam 

 the percentage of alkalies is evidently too large. A thorough 

 examination of the clays of the district would be warranted for 

 the demand for ground fireclay and firebricks of fair quality 

 is large. 



Petroleum. — Inspissated drops in some cases plastic, but more 

 often hardened, are found associated with dog tooth spar at the 

 quarry ford of the East river immediately north of the South 

 fault ; in the calcareous pavement of the George McKay seam, and 

 the limestone of Fraser Ogg's quarry. Blotches of petroleum 

 weighing a few ounces have been found associated with calcite 

 in firecla}^ beds under both the Main and Deep seams. 



A/uvi stalactites have formed from roof drippings in the 

 Acadia slope. 



Saline springs at a depth of over 1000 feet furnish samples of 

 sea water of Carboniferous times. These occur in both the 

 Acadia and McBean seams. 



Zinc hlende^^^ in some of the clay ironstones nodules and in 

 fissures of the measures. Pyrite both filamentous and cocks- 

 comb occurs in cavities, while in massive form it accompanies clay 

 iron stone in the coal of the Main and Deep seams. 



Gdlena in small crystals is associated with the zinc blende. 



Clay iron-stone in nodules and bands is very generally diflfused 

 throughout the shales. 



Blackhand iron-stone underlies the cannel of the upper part of 

 the Deep seam. 



Limonite on Waters' Hid is probablj^ at the contact of the 

 Devonian and Lower Carboniferous. 



Specular and Spathic ores in very thin veins apjDear in the 

 indurated beds at Fish pools. 



Hcematite pebbles occur in the New Glasgow conglomerate at 

 Alma and elsewhere. Conglomerate near the junction of 



(1) Geol. Report 1873-4 p, 1S9. 



