The marine Carboniferous of North-east Greenl. and its Brachiopod Fauna. 551 



river sections and the Cape Jungersen section, is fairly clear and 

 evident (see too, fig. 4). 



A comparison between the rocks from Koch's section and the 

 Conglomerate section makes it very probable that the bituminous 

 limestones with the alternating strata of marl-shale, which, in Koch's 

 section are seen between 240 and 275 metres above the sea, are 

 identical with the limestones found in the Conglomerate section at 

 175 — 200 metres above sea-level. The Spirifer siipramosquensis Nik. 

 occurring so abundantly in the Conglomerate section is, it is true, 

 not found in Koch's section in such well-preserved specimens that 

 their identity is undisputable, but the peculiar character of the rock, 

 and the agreement in position between the light limestones lying 

 beneath the bituminous beds, and which are found about 40 metres 

 under the lowest strata of the latter deposits, make the identification 

 very reliable (see the comparison between the profiles, pp. 524—525). 



In this series of strata we have at least 5 superpositions of 

 limestone over sandstone, signifying phases of oscillation in the great 

 transgression, while the alternation of the bituminous limestone with 

 the marl-shale ought, probably, only to be considered as smaller 

 changes, resulting from periodical preponderances of the organic 

 or the terrigenous material during the process of deposition, when 

 the conditions, in other respects, were almost uniform. As we have 

 already stated, no plant-fossils were found in the sections from Am- 

 drup's Land, so that it is impossible to state, with absolute security, the 

 presence of the terrestrial group there. According to Dr.WEGENER's pro- 

 file-sketch. Fig. 4, the oldest strata here should consist of those 

 found lowest down on the westernmost river, above which should 

 come the rocks found on the hill-summits to the west of the 

 river. The lowest stratum in the river is a dark gray, somewhat 

 bituminous limestone which presents a certain likeness to the 

 bituminous limestone in the sections from Holm's Land. The lime- 

 stone in question is covered with a gray-green sandy clay-shale 

 alternating with an impure limestone or spherosiderite, which, as 

 well from its exterior appearance as from the microscopical exam- 

 ination, seems to be a terrestrial formation. These beds probably 

 represent a transition from marine to terrestrial conditions, and 

 show an oscillation between them. The succeeding strata in the river 

 consist, reckoning from below, of dark, bituminous limestone (N:o 

 H6), gray clay-shale (N.o /62), and a yellow-red limestone (N:o 136) 

 resembling the Ambigua limestone of Beeren Eiland, and agreeing 

 perfectly with the limestone {N:o 155) from 200 metres above the 

 sea in Koch's section. 



The next following strata in the hill-summits to the west of the 



