The marine Carboniferous of North-east Greenl. and its Brachiopod Fauna. 535 



The lowest stratum in the profile at the river-mouth {N:os 106 

 and 118) consists of a limestone or a calcareous shale with numer- 

 ous fossils, which occur chiefly in the alternating calcareous depos- 

 its; of these may be noticed corals: a Syringopora and a large trunk 

 of a tabulate coral; of bryozoa especially a Fenestella, and several 

 examples of a Bellerophon and of a little gastropod. The rock is 

 dark-gray, with a tinge of violet; the shaly layers with fossils in 

 the more calcareous alternating deposits are probably the most 

 prevalent, but there occurs, in addition — to judge from the free- 

 lying material {N:o 118), an impure, very compact limestone, which 

 is highly recrystallized, and does not contain any other mega- 

 scopic fossils than some few branches of Bryozoa and, possibly, a 

 little species of Cladochonus. Of this rock only 2 metres are exposed, 

 and its position is 2 metres above sea-level. 



Above this limestone follows a series of limestones, termed by 

 Wegener "Knollenkalk" and with regard to which he states: 



"Ca. 50 m. dick, von demselben Character. Probe aus den 

 untersten Lagen, hier hell und sauber, weiter oben dunkler". There 

 are specimens of different limestones from several places in this 

 series of strata, as a rule dense in appearance, but which, on closer 

 examination, prove to contain fossils in smaller or greater numbers. 

 The specimens from the various levels are given in the sequence 

 in which they occur. 



From the lowest part of this limestone series there are speci- 

 mens of a light, gray-yellow, dense limestone {N:os 117, 127 and 105), 

 which, under the microscope, proves to contain a fairly large amount 

 of organic fragments : crinoid stem-joints, brachiopod spines and 

 foraminifera, inbedded in a pretty dense matrix. Here and there 

 the rock presents slickensides covered with a dark coating. In this 

 limestone there are silicified portions which have a more or less 

 flint-like and concretional appearance, to which Wegener's term 

 "Knollenkalk", evidently reters. On a microscopic examination of 

 the limestone it proved to contain parts where a silicification had 

 begun. A thin section from N:o 105, especially — which specimen 

 also contained a flint-like concretion — presented a silicification of 

 fragments of crinoid-stems, which showed a transformation to chal- 

 cedon, of a yellowish colour. A thin section from N:o 127 proved 

 to contain a few Fiisiilime. 



Somewhat higher up in the profile, 15 metres above the level 

 of the sea, begins a dense gray limestone without any larger fossils 

 {N:o 11^). from which, on the weathered surface project a few 

 fragments of crinoid stems, preserved in a red-yellow chalce- 

 don substance. The weathered surface presents fairly richly sec- 



