398 



Kiiomeu-es becii mapped as underlain by Silurian strata, 

 fossils have been recovered from only a very 

 limited number of localities. While perhaps 

 in the majority of the cases the fossils are of 

 Silurian age, in other cases they are definitely 

 known to be of Devonian age. Possibly it 

 would be more correct to consider the underlying 

 strata of this very extensive "Silurian" area as 

 being an assemblage of measures ranging in 

 age from lower Devonian to Silurian or even 

 older. The bulk of the strata are grey, calca- 

 reous slates and slate-like, impure limestones. 

 In places heavy beds of purer limestone occur 

 and these in some cases are fossiliferous. Beside 

 the above mentioned rocks, grey, green and red 

 slates, grey sandstones and conglomerates also 

 occur and locally bodies of fine-grained, perhaps 

 effusive, igneous rocks are present. The strata 

 are everywhere closely folded. 



147-4 m. Hartland Station — Alt. 151 ft. (46 m.). 



237-2 km. 



183-6 m. Perth Station — Alt. 243 ft. (74 m.). At 



295*5 km. Perth, the railway crosses to Andover on the 

 west side of the St. John. The strata under- 

 lying the country on both sides of the St. John 

 river from Hartland to Perth, all belong to the 

 "Silurian" and are largely grey, slaty rocks 

 varying in composition from a slate to an 

 argillaceous limestone. 



184-8 m. Andover Station — Alt. 257 ft. (78-3 m.). 



297-4 km. Several miles above Andover, the Tobique 

 river joins the St. John from the northeast. 



189-2 m. Aroostook Junction — Alt. 271 ft. (82-6 m.) 



304-5 km. Just beyond Aroostook Junction, the railway 

 crosses Aroostook river a large tributary from 

 the west. 



200-1 m. Ortonville Station — Alt. 352 ft. (107-3 rn-)- 

 322 km. About opposite Ortonville station, Salmon 

 river flowing from the northeast joins the St. 

 John. The valley of Salmon river is as^deep 

 and as pronounced as that of the St. John and 

 has the appearance of being the northeastward 

 continuation of the St. John valley. 



