APPENDIX I. 461 



quartz-sand with embedded strata of lignite. The same is also the case 

 in the lowlands east of Blaamanden and at the head of Stenknlfjord 

 in Baumann Fjord. In addition to the lignite, masses of slaty clay 

 were also found at the latter place, in which were well-preserved 

 remains of Sequoia Langsdorfii, Taxodium distithum var. miocenum, and 

 some others, well-known witnesses to a southern vegetation in these 

 regions, in a geologically late period, i.e. the Miocene. 



EEUPTIVE ROCKS. 



In addition to the above-mentioned sedimentary deposits, eruptive 

 rocks of different kinds are met with in various parts of Ellesmere and 

 Heiberg Lands. Dykes of these, for instance, exist in the Archrean 

 rocks in Havnef jord in this case porphyry and also in several locali- 

 ties in Henreka Sound, where they take the form of diabases and 

 porphyry. 



Of far greater importance are the volcanic rocks pressed in between 

 the strata of sedimentary rock, and the superincumbent layers of out- 

 flowed lava. Mention has already been made of how in the profile 

 of Cape Camperdown, on Bache Peninsula, various strata-like masses of 

 volcanic rock occur. The same are found in Foulke Fjord in great 

 prevalence ; and still further south, as, for instance, at Cape York, 

 ' basalts ' are known. It is a fact worth noticing that whereas the 

 aggregate thickness of the intrusive rocks at Cape Camperdown 

 amounts to about 3000 feet, the thickness at Fort Juliana, in Hayes 

 Sound, is considerably less, while up Beitstadfjord and at the head of 

 Flagler Fjord they are non-existent. 



Again on Grinnell Land we find similar rocks for example, at 

 Hareleiren, Blaafjeld, etc. in the form of thick intrusives. In this 

 manner also they occur in Heiberg Land, among other places at 

 Kvitberget and on Storoen, near the site of the depot. In all cases they 

 partially consist of quartz-diabases, dark and rather heavy, often holo- 

 crystalline, sometimes with remains of a vitreous basis, or granofyric 

 interstitial fillings. 



The rocks of this type which occur in Grinnell Land are found in 

 the shape of intrusives in Mesozoic schist, where a limestone probably 

 Triassic is so altered by contact that the fossils in it are more or less 

 indistinguishable. On the islands at Lands Lokk are similar masses, 

 possibly intrusives. They are lighter in colour, and consist of greenish 

 porphyritic rocks, with phenocrysts of felspar, olivin, augitc, and a very 

 close ground mass, resembling in its phenocrysts the lavas which appear 

 somewhat more to the south, at Sorte Va3g (Black Wall), in Heiberg 



