552 Karl A. Grönwall. 



river present, probably, the following series of strata; a light, gray- 

 green limestone (N:o 14-7), lowest, then, on two hill-tops, sandstone 

 {N:os 137 and 156), and, uppermost, dark, bituminous limestone 

 {N:o 163). The thickness of this series cannot be judged of, but, 

 in the western river, about 40 metres of rock have been accessible, 

 and, possibly, we may be justified in estimating the whole of the 

 series in the eastern river at about 100 metres. At a geological 

 level which, approximately, lies next above this series, a fragment 

 has been found which probably belongs to Spirifer supramosquensis 

 Nik., and is preserved in a rock very much resembling that rock in 

 the profiles from Holm's Land for which this fossil is characteristical, 

 while, in connection with this find there occurred red and red- 

 gray limestone. 



A bituminous dark limestone with intermediate marl-shale 

 deposits of the same type and, probably, occurring at the same 

 level, forms the lowest bed of the in the Eastern river section and 

 above this comes approximately 50 metres of light limestones, among 

 which there occur silicified strata and also dolomite. At about 90 

 metres above the level of the sea there occurs a bituminous lime- 

 stone of a type similar to the other bituminors limestones in this 

 group. Above this there is found a black, bituminous shale, with 

 straight cleavage, which is not to be connected with the above- 

 mentioned deposits, while, uppermost in the series, we have sand- 

 stone to a height of about 130 metres above the sea. 



We have here in all, consequently, a series of somewhat more 

 than 200 metres of rock, which, on the whole, present points of 

 agreement with the beds occurring in the sections from Holm's Land, 

 but which, in their arrangement offer certain irregularities that 

 render direct comparisons impossible. When we consider the in- 

 completeness of the profiles, they give, however, some basis for an 

 hypothesis. In the profiles from Amdrup's Land we have, it will 

 be remembered, dark-gray, bituminous limestone at various levels, 

 and this rock occurs both at the lowest and the highest horizons, 

 with a difference of level between them of about 180 metres. In 

 the collections from Holm's Land, the light limestones are repres- 

 ented at a higher level than are the dark, bituminous, and this dif- 

 ference from Amdrup's Land probably depends on the fact that, at 

 the various localities, different outcropping strata have been more 

 easily accessible to investigation. 



In any case, the petrographical agreement and, in part, the 

 palæontological too, give indisputable grounds for bringing together 

 for the sake of comparison the formations occurring in these sections, 

 although it is difficult to express an opinion respecting the thick- 



