BALTIC REGION 615 



slight thickness. The continuity of the section is interfered with by a 

 diabase dike. Close to this are the strongly metamorphosed Lower 

 Didymograptus beds, with characteristic fossils still recognizable. This 

 same zone appears again farther north on the banks of the Fogelsang 

 brook, where it carries Phyllograptus cor Strandmark. These beds are 

 described by Moberg as lying partly under (in the bed of the stream) 

 and partly over (in the E. banks) the Orthoceras limestone. The "Ortho- 

 ceras limestone" is shown in an old quarry near the brook; the west wall 

 of this quarry shows the lower part of the Upper Didymograptus bed, I be 

 zone of Phyllograptus cf. typus overlying the Orthoceras limestone. 48 

 "At the bottom of the most southerly limestone quarry, . . . on the 

 occasion when it was pumped dry, a slaty limestone was found, rich in 

 trilobites, aniong which may be mentioned Trinucleus coscinorhinus Ang. 

 and Aeglina umoonata (Ang.)/' This exposure was not accessible dur- 

 ing our visit. It is clear that there is some complication and confusion 

 here, though it would appear that the Trinucleus coscinorhinus beds are 

 included in or represented by the whole of the Orthoceras limestone, and 

 that the Upper Didymograptus beds overlie this limestone. If this rela- 

 tion is normal and not due to faulting, it settles the position of the 

 Trinucleus coscinorhinus beds as definitely below the break. 



The Upper Didymograptus beds are well shown in a steep bank on the 

 south side of the Sularp Eiver, just above the month of the Fogelsang 

 creek. Both the lower division with Phyllograptus cf. typus Hall and 

 the upper or Geminus division with Lonchograptus ovaius Tnll. arc here 

 shown, but no higher beds. These beds are also seen farther down the 

 Sularp Eiver at several localities, both in the bed and bank and on the 

 Fogelsang, but as isolated outcrops which show no relation to higher or 

 lower beds. At Sandbv West Mills, about 500 meters above the mouth 

 of the Fogelsang, the Lower Dictyonema beds are exposed not far from 

 the Geminus beds, the former being seen in a ditch close to the north 

 bank, the latter in the river bed and in the south bank. A short distance 

 to the west Middle Dicellograptus shales, Avith Orthis (zone of Ampyx 

 rostratus Sars. and Calymene dilata Tullb. of the Chasmops beds) ap- 

 pear, being brought next to the Geminus beds either by a fault or by 

 the cutting out of the Lower Dicellograptus beds in this region, and an 

 amplification of the hiatus which separates the Lower and Middle Ordo- 

 vicic series. The Orthis shales are limited above by a diabase dike, 23 

 meters thick, Avhich has burnt the shales white at this contact. 



The Lower Dicellograptus beds are exposed at a number of localities 

 on the Sularp River, both above and below the mouth of the Fogelsang. 



48 Moberg: Guide, p. 26. 



