BALTIC REGION 611 



probably the equivalent of B III /? of the East Baltic region. The suc- 

 ceeding beds of (Eland, from the Gigas to the Ancistroceras limestone, 

 are similar to those of Dalarne and elsewhere. 



The 8. jentschi conglomerate. — As having an important bearing on the 

 correlation of the (Eland strata, there should be mentioned the occurrence 

 in parts of Sweden and elsewhere of a conglomerate in the matrix of 

 which Strophomena jentschi is a characteristic fossil. 45 The cement "is 

 a light gray limestone, partly coarsely crystalline, partly compact, more 

 rarely merging into a coarse-grained, glauconitic sandstone with cal- 

 careous spar cement." 40 Besides 8. jentschi it contains Platystrophia 

 biforata Schloth, Illamus sp., and others. This would indicate the Cara- 

 doc or Trenton age of this bed, as well as that of the Lower Asaphus lime- 

 stone of (Eland. The pebbles of the conglomerate are phosphorites and 

 phosphoritic sandstones, the former bearing fossils of Upper Cambric age. 

 "The conglomerate was first observed by Gagel (1890) as boulders \_Ges- 

 chiebe] in East Prussia, but its age could not be determined until J. G. 

 Anderson had proved the occurrence of 8. jentschi in the Lower Asaphus 

 limestone ... in northern (Eland." 47 Subsequently the boulders 

 were found at Stonasa, in (Eland, at Gotland, and elsewhere, thus showing 

 a wide distribution. The home of the conglomerate is probably in north- 

 ern Sweden, where it rested on Cambric strata, and it probably indicates 

 the wide-spread overlap of the readvancing Upper Ordovicic sea over the 

 eroded surface exposed by the preceding retreat. As this seems the only 

 rational explanation, and as the associated fossils in the matrix stamp 

 the conglomerate as Upper Ordovicic, the finding of Didymograptus 

 caduceus in the bed with 8. jentschi on (Eland (if this did not come 

 from a lower layer) suggests that this may be a case of inclosure of 

 Arenig from an underlying source comparable to the inclosure of frag- 

 ments with Cambric fossils in the 8. jentschi conglomerate. 



ORDOVICIC OF SCANIA 



General discussion. — This region, in the extreme southern end of 

 Sweden, is of interest because it shows the dominance of the Graptolite 

 facies of the Ordovicic series. There is some difference of development 

 between the eastern and western sections, as brought out by Moberg's 

 detailed studies. It was my good fortune to spend the better part of a 

 week in the study of these Scanian deposits under the able and enthusi- 

 astic guidance of the late Prof. J. C. Moberg, of Lund University, whose 



45 J. G. Anderson, 1896 : Ueber die Cambrische und Silurische phosphorit-fiihrende 

 Gesteine aus Schweden ; also Moberg : "The Silurian of Sweden," p. 108. 

 ™ Moberg : Loc. cit. 

 47 Moberg : Loc. cit., p. 119. 



