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 Jérden 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 Jérden strata at this point. 
The zone was again seen about three fourths of a mile northwest of 
Tamsal 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 Jérden. The rock at these various places consists of a 
somewhat reddish, coarse-grained limestone which is not very 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 Jérden zone and consist of heavy- 
bedded (beds four to six inches thick) gray, crystalline limestone con- 
taining Favosites, Clathrodictyon, and rarely Pentamerus 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 and broken Pentamerus 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: — 
Cyathophylloides kassariensis Dybowski. 
Densiphyllum thomsoni Dybowski. 
Donacophyllum losseni Dybowski. 
schreneki Dybowski. 
Favosites gothlandicus Lamarck. 
Halysites agglomeratus Eichwald (= H. catenularia?). 
Soe Pa 
