XX 
ERIK A : SON STENSIO 
can be identified. Two of these horizons seem to te especially rich in fossils — one 
situated 61 m, the other 82 m above the fish horizons at Mt Viking. 
Of the real bone-beds known in the middle Triassic series one that is apparently 
of a rather local nature is found at Mt Viking and Mt Marmier at a height of about 
33 m above the fish horizon, 1 ) while another, which coincides approximately with the 
lower boundary of the Saurian horizon, has been found with certainty from Sticky Keep 
in the east to De Geer Valley in the west. Both these bone-bed are situated in a thin 
stratum of sandstone. 
The lower Saurian horizon seems to have been rich in fossils only at Dickson Land. 
At Mt Bertil, Mt Lundbohm, Mt Viking, Sticky Keep and Mt Andersson I have not found 
any vertebrates in the corresponding level. 
A short distance, about 18—20 m beneath the upper Saurian horizon there follows, 
at least at Mt Congress and Mt Bertil, at sratum with «aufgeklappter» Daonella. 
The proper upper Saurian level consists of calciferous shales and beds of limestone. 
At the top is found a bed with very large concretions, not infrequently containing 
Ichthyosaurians. The Ichthyosaurians occur most abundantly, however, in the calciferous 
shales. Daonella and ammonites are, on the other hand, most frequent in the strata of 
limestone and in the concretions. Only in more exceptional cases are they found in shale. 
The horizon seems to be thickest in the mountains of the Sassen Valley, where in 
Mt Viking, for instance, it is about 14 m, while at Dickson Land and at Cape Svea 
it is not 10 m. 
Upper Triassic series. —- I had no opportunity of studying in any detail the 
boundary between the upper and middle Triassic series. 
Above the upper Saurian level we soon get very soft shales with nodules of 
ironstone and these shales form an important part of the lower half of the upper 
series. They alternate, however, with beds of sandstone, which become predominant 
towards the top. In the very uppermost part at Mt Bertil and Mt Lundbohm I found 
a bed of green very soft shale. 
The evertebrates collected in the upper Triassic have not yet been investigated 
thoroughly and little can therefore be said as to the horizons in which they appear. 
They seem however, as Nathorst has stated to be mainly restricted to two horizons. 
The plant horizon already noticed by Nathorst is, as Wiman 1914 (1914b, p. 8) 
mentioned, discovered at Mt Bertil, Mt Tschermak and Sticky Keep. In 1916 Dr. E. Lund- 
strom found a plant-bearing horizon in the upper Triassic at Mt Trident as well, but 
it is uncertain whether this is the same horizon as the earlier known one. 
As the south end of Mt Tschermak, the only locality where I have been able to 
measure it in profile, the plant horizon is situated at a height of about 134 m above the 
upper Saurian level between the horizon with Lima spitsbergensis, Pecten Obergi, etc. and 
the horizon with Spiriferina lundgreni, etc. 
Some centimetres above the plant horizon 2 ) we find a thin band of coal and other¬ 
wise the conditions are as follows: 
q cf. foot-note on p. XXI. 
2 ) The plant fossils have been sent to the Palaeobotanical department of the Royal State Museum at Stock¬ 
holm for investigation but have not yet been described. 
