2^ t>r, forchhammer on the [JuLy, 



nites, &c. which might only be expected in the largest system of 

 Swedish transition rocks, that had been formed in the sea 

 iteelf. 



The island of Oeland consists hkewise only of transition 

 rocks, no granite or gneiss having been formed there. The 

 limestone is at the utmost 140 feet thick ; it covers the whole 

 island, except a few places on the west side, where other rocks 

 are seen, that lie under the limestone, viz. lowermost near 

 Aleklinta, a sandstone very compact and free from lime ; then 

 follows a bituminous shale with subordinate beds of swine- 

 stone without fossils. These beds of shale are, when compared 

 with those of the other systems, veiy imperfect, except in one 

 place, where they increase in thickness, change into alumslate 

 with the usual small entomostracitaj* in the beds of swinestone, 

 and with small anomites lenticularis.f The limestone is usually 

 red, and contains many orthoceratites, and the common ento- 

 mostracites expansus ; J with these exceptions it is quite free 

 from the remains of marine animals. 



The system of Westgothland is one of the most interesting on 

 account of the nature of the rocks which compose it, and the 

 external appearance of the country which it forms. The large 

 plain of Westgothland is formed of common gneiss, which, in 

 many places, rises into small hills, never high above the level of the 

 lake Wineren, and disappearing near the hills of transition rocks ; 

 so that it seems as if these had been deposited upon a perfect 

 plain. The gneiss likewise near the rocks of the transition for- 

 mation is somewhat different, principally on the east part of the 

 plain ; it contains green earth, instead of mica, and its feldspar 

 weathers veiy readily ; such is the rock at Lugnaes. The rocks 

 belonging to this system are, (beginning at the lowermost), sand- 

 stone, which rests upon the gneiss, and which in the east part of 

 this district is first met with at a height of 318 feet above 

 the level of the sea ; its thickness amounts to 77 feet, and it con- 

 tains no fossils. Upon this follows the alumslate, the lower- 

 most beds being the purest ; the upper ones are often only a 

 bituminous slate ; together about 78 feet thick. The next layer 

 is limestone, 202 feet thick ; it does not contain beds of other 

 rocks ; but the hmestone itself varies in colour, hardness, and 

 the fossils which it contains : the lower part is white, semicrystal- 



• EtUomostracites gibbosus. — Coccus, capita antice truncato planiuscuJo fronte oblonga, 

 jugoque ilorsali gibboso, cauda triangulaii utrinque bidentata, Wahlenb. Entomol. 

 paradoxus /9 cantharidum Linn. Syst. Nat. 



Entomoslracites scarabcroides. — Coccus, capite hemisphaerico antice rotundato, fronte 

 mibovato antrorsum angustiore, cauda utrinque sinuato-tridentato. Wahlenb. 



Entomoslrncites pisiformis. — Coccus hemispliaericus niarginatus ; fronte teretiuscula. 

 Wahlenb, Entoniolitlius paradoxus y pisiformis Linn. Syst. Natursc. 



•f jinomites Itnlicularis. — Clausus (nullo foramine nee hiatu) suborbicularis utrinque 

 convexicus oculus radiatim undulatus, 



X Entomottracltei cxpansuti oculis frontalibus, capitali testa antrorsum semiorbicu- 

 lari plana laevi; caudali magnitudincm capitis, &c. Wahlenb. Entomolith. paradoxus 

 et expansua, Linu, ;:^yst, ^at, Tiilobites dmtatus, Brunnich j T. novus, Schlottheim. 



