SILURIAN, 267 



On the south side of Rendalen appears the brown limestone of the capes, series A, with a 

 flat dip to the north-northwest; but on the north side of the valley is a division of dark schist 

 [shale], series B, lying conformably above the beds of brown limestone. Associated with these 

 schists, particularly in their lower and upper parts, are numerous layers of pure dark limestone, 

 frequently fossiliferous. In Rendalen and in. Kobbebugten, where this same division also 

 appears, a quantity of material was collected, of which 15 species are provisionally determined, 

 among them being Favosites sp., Strophomena cfr. euglypJia, NeristeUa in numbers, Rhynchonella 

 cfr. iorealis, Pentamerus cfr. galeatus, Spirifer cfr. elevatus. The period of this division in 

 series B is Wenlock. 



The upper part of series B appears, among other places, at the headland north of Tun- 

 neldalen, in Hvalrosfjord. Above a black shale containing Monograptus sp. and Leperditia 

 cfr. pJiaseolus is a bed of fragmentary limestone with Favosites, Strophomena cfr. pecten, Atrypa 

 reticularis, Pterinea cfr. sowerhyi. From a locality in Graasefjord, on the same horizon, were 

 taken Favosites cfr. Jiisingeri, Favosites gothlandicus, TTiecia swinderenana, Spirifer elevatus, 

 Spirifer cfr. crispus, Strophomena corrugatella Dav., Pterinea sp. According to these, the 

 period of this upper part of series B should be Ludlow. The thickness of the series is about 

 1,000 feet. 



In HeU Gate, as well as in Gaasefjord, these strata are overlain by series C, in its lower 

 parts consisting of interstratified light and dark marl schists, which are somewhat sandy, 

 while in its upper part appear pure quartz sandstone beds and argillaceous sandstone. The 

 collective thickness of these strata is about 1,000 feet in Gaasefjord, whUe in HeU Gate it is 

 probably somewhat greater. No fossils were found in this series. 



At the base of the high cliffs at Indra Eide and Borgen appears series C. In both these 

 places it is overlain by a dark limestone and black shale, partially fossiliferous. This dark 

 limestone and shale are the lowest layers in a series of strata at least 1,500 feet in thickness, 

 series D, which appears in the profiles on both sides of Gaasefjord, from Borgen to the foot of 

 Vargtoppen (Wolf Top), and from Indra Eide to Skrabdalen. 



In series Da occurs Atrypa reticularis in great quantities, but little else. On the other, 

 hand, there are preliminarily determined in Db about 55 species, of which may be mentioned 

 Favosites sp. div., Columnaria sp., CyathophyUum sp. cfr. hexagonum, Receptaculites sp., 

 Fenestella sp., Homalonotus sp., Burmeisteria sp., DecheneUa sp., Proetus sp., Orthis striatula, 

 Leptsena sp., Strophomena, Streptorhyncus, Atrypa reticularis aspera, Rhynchonella {Pugnxix) 

 cfr. reniformis pugnus, Productus cfr. prolongus, Spirifer of the vemeuilli Murch. type, a peculiar 

 Pentameride, Terebratula cfr. Dielasma, Pterinea sp., Modiolopsis sp., Lucina sp. div., BeUe- 

 rophon sp., Platyceras sp., Orthoceras sp., Gomphoceras, gigantic nautilus, and ganoid scales. 



The fauna in Dc is merely a repetition and, in the case of certain species, a further develop- 

 ment of the forms found in Db. It will thus be seen that there is a spring in regard to the fauna 

 between the upper layers in series B and the lower ones in series D, which more particularly 

 resemble Lower or Middle Devonian. The concordantly embedded (?) series C might, there- 

 fore, be thought to represent uppermost Silurian as well as lowest Devonian. 



Divisions Dd and Df are poor in fossils and are partly shale divisions. In the impure 

 limestone of Dg occur again numerous fossils, among which are Atrypa reticularis, Rhyncho- 

 nella cfr. cuboides, Spirifer cfr. undifera, Productus sp., Terebratula cfr. Dielasma, Pterinea 

 sp., Avicula sp., Modiolopsis sp., Pleurotomaria sp., Proetus sp. Traces of placoderm fish 

 are also met with. Above these strata are beds of pure limestone, Dh, and above these again 

 some less pure, Di. The uppermost strata of Di alternate with strata of light-gray quartz 

 sandstone terminating in a clay sandstone, which in places is richly fossiliferous, though the 

 fossils are in a bad state of preservation. Among these are Lamellibranchiata, DecheneUa 

 sp., remains of Holoptychius, etc. 



This argiUaceous sandstone is simultaneously the last link in series D and the first in 

 series E. This is a huge coUection of quartz sandstone strata building up the mountains 

 on both sides of the inner part of Gaasefjord. The lowest part, which is 900 to 1,200 feet in 

 thickness, consists almost exclusively of quartz sandstone. On the north side of Skrabdalen 



