262 W.G. Fearnsides—Lower Ordovician Rocks of Scandinavia. 
appear to be unfossiliferous. Half a mile further up the same stream, 
however, greyer shales containing a multitude of crushed Bryograptids. 
(B. Kjerulfi) alternate with thin bands of impure limestone containing 
Shumardia, and are seen to underlie the Ceratopygekalk (C). 
In Eastern Skane (S10) the Dictyonema beds are better exposed, 
and at Flagabro the gradual mutation of the Dictyonema type along 
the lines suggested at Krekling can be followed in all details. 
The usual Dictyonema in Swedish collections seems to come from 
Flagabro and are of the true Dictyograptus flabelliformis type. At 
Gislofshammar, south of Simrishamn, the section is mostly under 
the sea, but the beach material thrown up provides beautiful late 
Dictyonemas of a basket-work type interbedded with Clonograptus, 
in addition to all the types seen at Flagabro. At Jerrestadt 1 was 
able to find the bed with Clonograptus flexilis, also that with 
Dictyonema norvegica, but was most interested in finding an orsten 
within the Acerocare zone which was full of Mode and, I think, 
Symphysurus also. At Andrarum (8 9) the main section stops at the 
Parabolina heres zone, but in the stream bed below the Pannhusset 
I had the good fortune to find a fine orsten containing an early type 
of Dictyonema together with Hysterolenus. 
In Oland the Dictyonema and Bryograptus shale succession is much 
reduced, and complete only in the extreme south (02 and O04). The 
Acerocare zone at the top of the Alum Shales is nowhere separated, 
but exposures are poor at this horizon, and there is no reason to 
suppose that it is absent. Dictyonema shales to a thickness of 7 feet. 
are recognized along an outcrop of about 20 miles in the south of 
the island. The only Dictyonema I could find are of the D. flabelliformis: 
type, but the upper beds with abundant Odolella Salteri contain 
broken stipes of true graptolites, which are probably Clonograptus, and 
pass up to about 6 feet of similar shales containing brachiopods and 
trilobites which continue on into the Ceratopygekalk above. North 
of Borgholm (0 5) Dietyonema occurs in certain orsten pebbles and in 
the soft shales which form the matrix of a curious phosphatic con- 
glomerate which is found there. This conglomerate is very inconstant 
and always quite thin; it rests upon and among sundry remanié orsten 
concretions of the various zones of Olenus shales, and the shaly beds 
of its matrix pass gradually up into 3 or 4 feet of quite ordinary 
Alum Shales with orstens. These in their lower part contain Odolus 
Saltert and horny brachiopods, while in the upper is the Orthis 
Christian’ so common in the Ceratopygekalk. Further to the north 
Dictyonema and Obolus shales together thin to less than 20 inches. 
Cherty bands with thick-walled Odolus then come in, and the whole 
passes to a nodular sandy mass quite like the Obolus Apollims 
conglomerate of Dalarne (D1) and Western Russia. In this the most. 
northern district of Oland the basal Dictyonema shales or conglomerate 
. transgresses still further, and rests upon the denuded but unweathered 
edges of the lower Olenus shales and the Paradoxides shales and 
sandstone (O06). 
In Vester and Oster Gotland the A beds are again incomplete, but 
the law of the presence or absence of the various members remains to: 
be discovered. I find no record of the occurrence of the Acerocare 
