Addendum 
The age of the Brachiopod yielding beds 
of Cockburn Island 
by 
J. G. ANDERSSON. 
The careful examination of the fossil Brachiopoda from Graham Land, carried 
out by Mr. S. S. BUCKMAN, has shewn, amongst other important results, need for 
a revision of my determinations of the age of the Brachiopod yielding beds of 
Cockburn Island (Bull. Geol. Inst. Upsala, Vol. VII, 1906). As Mr. Buckman’s 
opinions have far-reaching consequences for the geology of this part of Antarctica, 
I have found it desirable to add to his paper some few words on these questions. 
The Glauconitic Bank, one of the deposits in question, is described in my 
paper (page 41) in the following manner: 
»At loc. 13 a thin basalt-dike traverses the sedimentary beds. Close to this 
dike, in soft sandy beds of common Snow Hill type, was found a layer, about one 
meter in thickness, rich in glauconite and quite crowded with fossils, mostly small 
forms: a globulous bryozoan, two species of brachiopoda, small gastropoda etc. 
This fauna of pygmean forms is quite different from the typical fauna of the Creta- 
ceous beds of this I'egion, and as no common Snow Hill fossil was found in the 
sandy beds in which the glauconitic layer lies intercalated, it is somewhat doubtful 
whether this layer with its surroundings belongs to the Cretaceous series. But, as the 
sandy beds of this place seem to be connected on both sides with indubitable Cre- 
taceous strata, I think this singular bed, too, is most probably only an intercalation, 
with anomalous petrological and faunistic facies, in the normal Snow-Hill sediments 
of Cockburn Island.» 
In the figure on the next page I have given a somewhat more detailed illustra- 
tion of my observations on Cockburn Island. 
At 12 is a place described in my earlier paper, p. 41. The whole slope, at 
least to a height of 150 m., consists of beds with Cretaceous fossils. Ten meters 
6 — 082 Hi Schwedische Südpolar- Expedition igoi — rgoj. 
