Skånes Colonusskiffer 



65 



seven species have stratigraphical significance. Not even the two graptolites have 

 any greater importance for our purpose, as they are found not only in the Lower 

 Colonus beds but also in the upper part of the Cyrtograptus shales. 



Assuming the layers on the two localities to be very nearly of the same age, 

 we must regard the occurrence of Monogruptus FJemingi Salt, at loc. b as decisive 

 for our interpretation of the geological age, since there is every reason to believe 

 that Cardiola interrupta Sow. which also is found in these layers, deserves no greater 

 reliance as a zone-fossil. Of course we must, at present, place the Cardiola-bearing 

 shales at Smedstorp among the Cyrtograptus shales, thus mustering them out from the 

 Colonus shales. 



This somewhat surprising result of our examination illustrates in an evident 

 manner how much we are wanting a thorough revision of all the strata which, 

 justly or wrongly, now are classified as Colonus shales. 



Lunds Universitets Årsskrift. N. F. Afd. 2. Bd 11. 



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