BALTIC REGION 



599 



in Gralicia and elsewhere. In Sweden it occurs in the Lower Chasmops 

 limestone of Dalecarlia. Another species of Orthis confined to B III a 

 is Orthis callactis Dalman, which occurs in the Asaphus limestone of 

 Dalecarlia. Lycoplioria micella Dalm. is another species appearing here 

 for the first time and ranging through B III, and so is Strophomena 

 jentschi Gay, important as characterizing the Asaphus limestones of 

 (Eland and the boulders of limestone conglomerate to he referred to later. 

 The second member of the Asaphus limestone, B III /?, is a mottled 

 yellowish to reddish limestone, with a thickness of about 3.5 meters. The 

 fauna is not markedly distinct from that of B III a, but is especially 

 characterized by Asaphus raniceps Dalm. Four species of Megalaspis 

 occur here, including M. aculicaiida, which also occurs in B III a, and 

 has a related form in B II y. Megalaspis heros Dalm. also occurs here, 

 and Asaphus expansus Dalm. is continued upward from B III a. The 



W E 



Figure 5. — Diagram illustrating the westward, Increase of the Hiatus between Divisions 

 B II and B III in Esthonia 



(Modified after Lamansky) 



horizon carries a thin layer of lenticles of brown iron oxide (Untere Lin- 

 senschicht) a short distance above the base, in which, according to Ray- 

 mond, Piiomera fischeri and Lycoplioria micella are especially abundant. 32 



The upper division, B III y, is a heavy bedded limestone, about 6 me- 

 ters thick, and is especially characterized by Asaphus eichwaldi F. S. and 

 Ptychopyge (Pseudasaphus) globifrons Eichw. This fauna differs more 

 from the preceding two than do their faunas among themselves. Several 

 of the trilobites, however, as well as a number of brachiopods, are common 

 to all these divisions. The most marked character of this division is, 

 however, the appearance of numerous Oephalopods of the genera Endo- 

 ceras, Vaginoceras, Planctoceras, Estonioceras, and Cyrtoceras. The gas- 

 tropods Raphistoma, Maclurea, and Salpingostoma also occur. 



A second zone of phosphatic pebbles (Obere Linsenschicht ) often sep- 

 arates this horizon from the succeeding Echinosphserites limestone, C 1. 



32 Raymond compares these "Linsen" to the disklike oolitic grains of the Clinton iron 

 ore of North America. He places this and the succeeding Division B III y in his Kunda 

 formation, from which he, however, excludes Lamansky's Division B III a. 



