340 



A. G. Nathorst. 



lower inwards in consequence of tlie gentle slope of its surface to 

 the westward. The Archaean rocks west of the carboniferous deposits 

 rise to their usual height of about 1000 meters. 



There is a gentle dip of the carboniferous strata towards the 

 east and north, and the oldest deposits are consequently found at 

 the western boundary of the formation. On the northern side of 

 Hecla Sound (at x on the little sketch-map text-fig. 1) there were 

 collected some impressions' in loose slabs of a micaceous slate at 

 the base of the mountain, probably originating from a similar rock 

 which forms the lowest accessible part of the mountain-side and 

 which is intercalated with and covered by a fine shale without 

 fossils. The slate also includes some strata, mostl}' thin, of a reddish 

 sandstone. 



As the dark, almost black, colour of the shale prevails up to 

 the summits of the mountains it is supposed that these wholly 



consist of this same rock, the 



II I-« 500 



[тУ^^Р^Л thickness of which consequently 



- ^ ' I ' I ' I Пд must be about the same as the 



^й- р^г^т-^^ height of the mounlains or 300 - 



J^ ' I ' I I i ^^i^ ^ 400 meters (as minimum). 



d-: ; ' :U ■;'.';-! ' '^ г^5 About 7 kilometers east of this 



d ^^/v:V/ -.' 'T^T^ '" locality, namely at "the Depot 80° 9'", 



^ ;.|^У;/У:;;]С{\:: «T^?^ the following section was measured 



a^^^^^ksS^^'os (text-fig. 2). From the foot of the 



= — ^ v^° 



V^^s:^ mountam up to 100 meters above 



УчУуУ^'^^^ sea-level the rock is hidden by loose 



Fig. 12. Section of the carboniferous rocks debris, but at the height mentioned 



at the Depot 80° 9'. (a), fine and soft black the shale again presents itself as 



shale; (b), grey shale; (c), conglomerate; ^^^ almost black stratum 30 meters 



(d), sandstone without fossils; (d"), fossili ,, . , m, . , , . ■• 



, ^ , , ■.. . . , thick. Ihis stratum is composed 

 ferous sandstone; (e), limestone rich ^ 



in corals. of alternating beds of a grey some- 



what coarser shale (b) and a black 

 fine and soft one (a) which is especially prevalent in the lower 

 part (about 5 meters). The shale is covered by a conglomerate of 

 dark red colour (c), which now prevails up to 200 meters above sea- 

 level. The pebbles of this conglomerate are well rounded and very 

 small, their size being about that of a hazel-nut, but even this 

 gradually diminishes upwards so that the conglomerate gradually 

 passes into a red sandstone, which forms the rock until a beighl 

 of 275 meters above sea-level is reached. The grain of this sand- 

 stone varies, coarser or finer, as also does the colour: red, white 



' Kno r r I a -form of L e p i d о d e n d r о n. A. (1. N. 



