554 Karl A. Grönwall. 



Characteristic rocks from the Cape Jungersen section are the 

 white limestone, consisting of rolled calcareous fragments (pp. 538 — 

 540), and the red sandy limestone, in which algae have been found. 



Of the free-lying fragments, the greater part has been obtained, 

 partly at the Mallemukfjæld, and partly from Esquimo Naze. It 

 has been found possible to divide the rocks obtained at these places 

 into three groups: a) coarse-graind limestone; b) fine-grained like- 

 stone; c) silicified limestone, of which groups, however, a) and b) 

 pass into each other: for the description, see pp. 527 — 528. All these 

 limestones have been deposited in fairly shallow water, and under 

 approximately similar conditions; the silicified limestone has pos- 

 sessed about the same characteristics as the others in their original 

 development. At present it forms an almost completely silice- 

 ous, dense rock, and can easily be distinguished from the fragments 

 of the other limestones whose fossils have become silicified, possibly 

 during a later period. The silicification in this case has occurred 

 with the fossil valves, in the well-known rings of silica. 



The connection between the succession of the strata in the 

 Cape Jungersen section and the free-lying boulders from the Malle- 

 mukfjæld and the Eskimo Naze becomes very evident from the 

 finds of the characteristic rocks; for example, there has also been 

 found at the foot of the Mallemukfjæld a boulder {N:o 168) of the 

 white, crystalline limestone which consists of rolled calcareous frag- 

 ments, while, on the cliffside in the Cape Jungersen section there 

 were collected talus boulders, both of the coarse-grained and the 

 fine-grained limestone that had been obtained from the Mallemuk- 

 fjæld and the Eskimo Naze. 



North-east of the Cape Jungersen section, collections have been 

 made on Amdrup's Land, partly from the solid rock on Henrik 

 Kröyer's Islets and the mainland behind them, and partly of boulders 

 at both these places and also at Sophus Müller's Naze. 



All the above-mentioned rocks in situ are crystalline dolomites, 

 evidently greatly altered limestones. 



The boulders from these localities present a number of peculi- 

 arities, and they cannot all be referred to the rocks that have been 

 obtained from the localities already treated of. 



White, and somewhat crystalline limestone, consisting of rolled 

 calcareous fragments, and which has, later on, been greatly re-crys- 

 tallized, occurs fairly abundantly, as at Henrik Kröyer's Islets there 

 has been obtained a boulder of this rock, containing Produdus 

 timanicus Stuck., while at Sophus Müller's Naze, 3 boulders were col- 

 lected containing 2 specimens of a Produdus belonging to the semire- 

 ticalatus group, and also a specimen of Spirifer cfr. striatus Martin. 



