216 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Here the upper Trinucleus shales, also called the Staurocephalus 
shales, are reported to be very fossiliferous and add Stauwrocephalus 
clavifrons, Acidaspis centrina, and Maneinge: parabola to the list of 
species found at Kinnekulle. 
OELAND. 
The Ordovician on Oeland rests on Upper or Middle Cambrian 
strata and the basal member may be either the Dictyonema shale or 
the Ceratopyge shale. This has been especially well brought out in 
an instructive diagram by Fearnsides (59). The most complete 
section of the “Ceratopyge Region”’ and Cambrian is shown in south- 
ern Oeland, where, ignoring subzones, the following strata are found, 
in descending order. 
( Glauconite shale. 
Ceratopyge limestone. 
Glauconite shale. 
Shumardia shale. 
Dictyonema shale. 
( 
Ordovician 
Peltura limestone. 
Upper Cambrian Olenus shale. 
Paradoxides forchammeri zone. 
P. tessini zone. 
| P. oelandicus zone. 
Middle Cambrian 
—— 
It has been shown that in passing northward both the Dictyonema 
and Shumardia shales pinch out, but at the northern end of the section 
both come in again, the Dictyonema shale being in certain localities 
replaced by the Obolus conglomerate. At the southern end of the 
island the Ordovician rests upon the youngest known beds (zone of 
Peltura scaraboides) of the Upper Cambrian. About midway between 
the northern and southern ends the Peltura beds disappear and the 
Ordovician rests for a short distance on the lower part of the Upper 
Cambrian. From Borgholm for several miles north the Ordovician 
rests on the next lower zone of the Cambrian, the Paradoxides forcham- 
mert zone of the Middle Cambrian. Still further north this gives 
place to the next lower zone, that of P. tessint. The strata of the 
Paradowxides tessint zone are here sandy, and it is where the Ordovi- 
clan rests on them that the Obolus conglomerate is developed, thus 
indicating the local origin of the material in the Lower Ordovician. 
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