TWENHOFEL: expedition to the BALTIC PROVINCES. 317 



. The type-section of this zone is exposed in an old quarry near and 

 across the road from Jorden church (Plate 3, fig. 1). Only about 

 seven feet are shown. At the base are four feet of mottled gray and 

 red dolomitic limestone and this is overlain by three feet of the Borealis 

 bank. No fossils were seen in the Jorden strata at this point. 



The zone was again seen about three fourths of a mile northwest of 

 Tarasal and also southeast of that village. West of Tamsal about two 

 feet are exposed and there is perhaps a little more in the woods to the 

 southeast of the village. At Podrang, south of Tamsal, it is probable 

 that the basal portion of the thirteen feet which are shown there may 

 belong to the Jorden. The rock at these various places consists of a 

 somewhat reddish, coarse-grained limestone which is not Aery fossili- 

 ferous. 



The division was also seen near Hapsal on the Weisenfeld estate, 

 about a mile west of the dwelling. The quarry is quite large and the 

 exposures are particularly good. About six feet are exposed of which 

 the lower three feet belong to the Jorden zone and consist of heavy- 

 bedded (beds four to six inches thick) gray, crystalline limestone con- 

 taining Favosites, Clathrodictyon, and rarely Pcntamcrus borealis 

 Eichwald. Above lie three feet of thin-bedded, yellowish, semi- 

 crystalline limestone which contains a great abundance of Favosites, 

 species of the Heliolitidae, Halysites catenularia, Clathrodictyon, and 

 entire arid broken Pcntamerus borealis. On the island of Dago the 

 outcrop of Puhhalep probably belongs to this division. The expo- 

 sure consists of from four to five feet of coarsely crystalline, thin- 

 bedded (beds 1-3 inches), dolomitic limestone which contains little 

 other than corals. Other outcrops on Dago are those of Grossenhof 

 and Kallasto. 



The fossils of this division are few in number and generally not well 

 preserved. They have not yet been studied by the writer and the 

 species listed with few exceptions are taken from others. Near the 

 base is a small fauna which promises much of interest, but until care- 

 fully studied nothing will be said concerning it. Schmidt gives as the 

 fossils most characteristic of the Jorden beds, the following species : — 



1. Cyathophylloides kassariensis Dybowski. 



2. Densiphyllum thomsoni Dybowski. 



3. Donacophyllum losseni Dybow^ski. 



4. schrencki DyboAvski. 



5. Favosites gothlandicus Lamarck. 



6. Halysites agglomeratus Eichwald (= H. catenularia?). 



