244 ON THE GEOLOGY OP ST. JOHN. 



till the strata shall have been co-ordinated with deposits in regions 

 better known. 



Portland Series (Nos. 7 and 8 of Dawson), thickness un- 

 known. Granite and syenite, mica, schist and gneiss, limes- 

 tone?, clay slate, and sandstone. Fossils, fragments of plants 

 in the upper beds. 



Coldbrook Group (No. 6 of Daw. in part), thickness 3,000 feet 

 or more. 



a. Greenish grey slate, stratification very obscure. 



b. Bright red slaty conglomerate and dark red sandy shale. 



c. Reddish conglomerate and grit, hard grey sandstone. 



St. John Group (Nos. 5 and 6 in part of Daw.), thickness 3,000 

 feet or more ; several zones of soft black and dark grey 

 finely laminated shales alternating with zones of coarser grey 

 slates containing numerous thin beds of fine grained sand- 

 stone. Fossils, lingula, a conchifer, annelides, coprolites. 



Bloomsbury Group (No. 4 of Daw.), thickness 2500 feet.* 



a. Basalt, amygdaloid, trap-ash, trap-ash slate; some beds of 

 conglomerate. Thickness 2000 feet. 



b. Fine grained red clay slate ) ThickneSs 500 feet _ 

 Reddish grey conglomerate ) 



Little River Group (Nos. 2 and 3 of Daw.), thickness 5200 

 feet. 



a. " Dadoxylon sandstone," grey sandstone and grit with beds 

 of dark grey shale, sometimes graphitic. Thickness 2800 ft. 



Fossils. Numerous plants, several crustaceans, wings of insects. 

 (C. F. Hartt.) 



b. " Cordaite shales," grey, greenish, and red shales ; reddish 

 and grey sandstones, grits, and conglomerates, alternating 

 with the shales. Thickness 2400 feet. 



Fossils. Cordaites, Calamites, Stigmaria, Ferns, &c, for the 

 most part identical with those of the preceding section. 

 (?) Granulite or granitic sandstone, micaceous slate, trap-ash. 



* Where groups appear on both sides of the synclinal fold the average 

 thickness has been given. The measurements are to be regarded as 

 merely approximate. 



