BALTIC REGION 



613 



up occur Diplograptus foliaceus var. calcaratus Lapw. and Dicellograptus 

 forchhammeri Gein. We have thus the Dicellograptus or Normanskill 

 shales following almost directly on beds of Deepkill (Arenig) age, as in 

 eastern North America, but with a thin limestone, probably representing 

 the Megalaspis limbata beds, intervening. If this limestone is correctly 

 identified, the break in the series comes above it, this break representing 

 the greater part of the Arenig and of the Lower Llandeilo, or, in Ameri- 

 can terms, most of the Beekmantown and the whole of the Chazy. 



A nearly continuous section is exposed in the stream bank south of 

 Tommarp, which I here reproduce from my notes (figure 9). The beds 

 dip at a gentle angle to the north, this dip being lowest at the southern 

 end of the section. Here a quarry has been opened in tlic "Orthoceras 

 limestone," which here represents the Megalaspis limbata limestone. The 



N s 



Figure 9. — Section in the Stream Bank south of Tommarp, Scania, in southern Sweden 



a, Megalaspis limbata limestone ; b, Trinucleus coscinorhinus beds ; e, black sbalc with 

 Dicranograptus clingani; d, covered ; e, Trinucleus shale 



limestone is in thin layers with shaly partings, the whole dipping about 

 20° to the north. Fossils are scarce, but I succeeded in finding a speci- 

 men of the pygidium of Megalaspis limbata. This limestone is followed 

 by thin-bedded, dark, mainly black, fine-grained calcarenites, from which 

 Trinucleus coscinorhmus Aug. and some other fossils have been reported. 

 We, however, did not succeed in finding any of these. 



Overlying this limestone are dark shales with Dicranograptus clingani, 

 from which we also obtained some small brachiopods. After a covered 

 interval, which may represent the zone of Pleurograptus linearis Carr. 

 which we saw at Jerrestadt, a similar black shale with thin limestone beds 

 completes the section. This is the zone of Trinucleus, the base of which 

 is marked by a layer of ir6n pyrite concretions. 



In spite of the good exposures (for Scania) of these beds, it was not- 

 possible for me to obtain any satisfactory physical evidence of the break 

 in this section. It is perfectly clear that the break exists, since all the 

 representatives of the later Arenig and early Llandeilo are absent. Even 

 if the zones are represented in western Scania, a number are wanting here, 

 these being, in ascending order, the zones of Phyllogr. typus and Dicly- 



