X 
ERIK A : SON STENSIO 
In 1904 and 1907 Smith took the Daonella and Posidonomya beds of Spitzbergen 
to be homotaxous with the middle and lower Muschelkalk respectively. 
In 1905 (p. 221) Noetling gave the following scheme for the horizons then known 
from the Ice Fjord: 
Upper 
[ Noric stage . . Limestone with Halobia cf. neumayeri, Spiri- 
1 ferina lundgreni and Pseudo- 
monotis spitzbergensis. 
Karnic stage. . Limestone with Lingula polaris and Lima spitz¬ 
bergensis. 
Ladinic stage . Limestone with Halobia Zitelli. 
Limestone with Daonella (D. lindstromi). 
Limestone with Posidonomya. 
In 1910 (p. 126) Wiman published the following section measured in the Ice Fjord 
district by B. Hogbom. The lowest horizon in this section is denoted by o. The other 
figures indicate the height of the different horizons above this horizon. 
Probably Jurassic. 
Triassic. 
Mainly yellow sandstones. 
Bed of sandstone.504 m 
Rhaetic? fauna of Bivalves.about 450 » 
Bed of sandstone.345 » 
Middle Trias 
Mainly black shales. 
1 3 15 » 
Diabase.U 
( 3 oo » 
Ironstone... 220 » 
(210 » 
Daonella shales proper, with D. lindstromi (Upper saurian horizon) . 
Horizon with «aufgeklappter» Daonella..184 » 
[170 > 
Fauna of Bivalves.. { _ 
U57 * 
Lower saurian horizon . .'.. 9 3 » 
Fish horizon (Posidonomya shales). o » 
The names upper and lower Saurian horizon and fish horizon are chosen by 
Wiman because of the abundant occurrence of Saurians and fishes respectively. With 
regard to the lower Saurian horizon Wiman says that even if stratigraphically it should 
belong to the Posidonomya shale and thus be homotaxous with the lower Muschelkalk, 
yet it cannot belong to the older part of this. Wiman points out in the Posidonomya 
shale the occurrence of a flat «Ceratites »-like ammonite, which, as we shall see, is of 
considerable interest from a stratigraphical point of view. 
Nathorst in his account of 1910 (pp. 350— 36 o) follows Mojsisovics with regard to 
the age of the different horizons. He considers, however, that he lias found that a 
