12 
J. G. ANDERSSON, 
(Schvved. Südpolar-Exp. 
the two portions of the dike is highly micaceous and its stratification is twisted and 
indistinct. In this dike the decomposition is much farther advanced than in No. i. 
The kernels left by the weathering do not exceed o.i m. in length and also in these 
balls the eruptive is largely deca}^ed.» 
N s 
s (i s d s 
Fig. 6. Diabase-dike (d) 'weathered but containing comparatively fresh kernels, ike dike traversing 
the Devonian sandstone (s). Fox Bay. 
After a microscopical exaniination of this rock Prof. NordenskjÖLD has cha- 
racterized it as a type quite different from that of dike i. It is a red diabase- 
porphyrite with porphyric individuals of plagioclase in an ophitic ground-mass con- 
sisting of plagioclase and granular masses of augite. Olivine is not with certainty 
noticed in this rock. 
Archæan basement of the sandstone-formation. 
While on board a coast-schooner passing along the south coast of W. Falkland 
I observed in Cape Meredith, the southernniost point of the island, a section of 
special interest. Fig. 7 gives the appearance of this cliff as I sketched it from the 
ship. For better orientation I have added the sketch-map fig. 8. At the entrance to 
Port Stephens the sandstone-formation descends to the sea-surface, and it forms also 
the upper part of Cape Meredith, but here the nearly horizontal strata of the sand- 
stone rest with an irregularly undulating boundary-line upon an older, highly disturbed 
formation. In the eastern part of the section {afj the basement of the sandstone 
Fig. 7. Coast-section, Cape Meredith. 
«1 = granite and gneiss; a., = schists?: d = pink-coloured dike; r = sandstone. 
