208 bulletin: museum of comparative zoology. 



Jemtland. 



The most recent general account of the Ordovician of Jemtland is 

 that given by Wiman (87), to which account must be added certain 

 facts obtained later by Moberg (75), Wiman, and Hadding (60). 



The section of Palaeozoic rocks there is given by Wiman as follows : 



Pentamerus kalk. 



? 



Chasmopskalk with Graptolithenschiefer. 

 Orthocerenka 1 k. 

 Underer Graptolithenschiefer. 

 Ceratopyge kalk? 



f Olenidenschiefer. 

 Alunschiefer < 



[ Paradoxidenschiefer. 

 Quarzit. 



The so-called Ceratopyge limestone is conglomeratic at the base, 

 containing fragments of the Olenus shales. Above it is a limestone 

 with much glauconite, and at the top a somewhat pure limestone. 

 This limestone contains some fossils, referred by Moberg definitely 

 to the Ceratopyge fauna but which seem to indicate fully as much 

 affinity with the Planilimbata limestone. Moberg lists, from Tos- 

 sasen: — Orthis christianiae, Niobe laeviceps, and a Cyrtometopus. At 

 Klofsjo he found Niobc insignis and a Mcgdaspis like M. stenorha- 

 chis Ang. The thickness of this limestone is not stated but one would 

 infer that it was about one meter. 



This is succeeded by a green and gray graptolite-bearing shale, 

 which with the limestone below, make a total thickness of fifteen 

 meters. In the shale are lenses and one continuous bed of limestone. 

 The shales have afforded Wiman: — 



Pliomera sp. Didymographis filiformis Tbg. 



Megalaspis sp. D. hirundo Salter. 



Leptaena sp. Phyilograptus sp. ind. 



Tetrugraptus serra. Tdragraptus qiiadrihrachiatus. 



In the limestone he found: — 



Megalaspis sp. Ampyx sp. 



Niobc laeviceps Dalm. Orthis sp. 



