Pro/. Lajncorth — Fdmozoic Rocks of Britain ^ Scandinavia. 319 



iLe island. Lowest of all occur (1) arenaceous flagstones with 

 Paradoxides Tessini, Liosfracus aculeatus, Ang., Ellipsocephalus 

 muticus, Ang. Next is supposed to occur a peculiar zone, as yet 

 recognized in no other region — (2) the Zone o^ Paradoxides Olandiciis, 

 Sjog., consisting of greenish shales and interstratified calcareous beds 

 with few fossils. Lastly, we have (3) the widely-distributed Zone 

 of P. Forchliammeri, or " Andrarum Limestone," with all its charac- 

 teristic species.* There is here no visible trace of the terminal or 

 Agnostus Icevigatus zone ; but the Andrarum Limestone is at once 

 surmounted by the basal zone of the Olenus-bearing beds. In the 

 lowest strata (1) of the Olenidian occur the usual forms of Agnostus 

 pisiformis, Linn. Next come (2) strata with Beyrichia Angelini and 

 Olenus gibbosus. Above these follow (3) the beds with OrtJiis 

 lenticularis (representing the zone of Parabolina spinulosa?), leading 

 up into (4) shales with Leptoplastus and Eurycare latum, and the 

 Olenidian section is terminated by the ubiquitous zone of (6) Peltura 

 scarabeoides and SpJiaropJithalmus. 



Cambrian Pocks of Norway. 



Our chief authority for the physical and palaeontological succes- 

 sion among the Cambrian deposits of Norway is the veteran geologist 

 Professor Kjerulf, of Christiania, who has recently added to his 

 many accurate and well-known memoirs^ on the rock-formations of 

 Southern Norway, a voluminous and elaborate work on the Geology 

 of Southern and Middle Norway,^ in which the manifold results of 

 the labours of himself and his colleagues are ably summarized for 

 the general student. Excluding from our present consideration those 

 areas where it is supposed by the Norwegian geologists that the 

 Lower PalEeozoic Eocks have loeen more or less metamorphosed, we 

 find everywhere in Norway the same general arrangement of sedi- 

 ments and fossil forms we have already recognized in Sweden. A 

 formation of quartzose sandstone of variable thickness rests uncon- 

 formably upon the gneissose rocks, and supports a thin group of 

 Alum Schists (rarely more than 100 feet in thickness) with Para- 

 doxides and Olenus. The sandstones are usually much thinner than 

 in Sweden, and the Paradoxidian is occasionally more or less 

 arenaceous in character, and is developed only in certain localities. 



At the railway station of Krekling, near Kongsberg, the lower 

 heds have been studied in detail by Brogger, who was the first to 

 detect the existence of the Paradoxidian in Norway. Here* they 

 consist of the following members :— 



' Linnarsson, lakttagelser pa Oland, p. 6, etc. 



- Kjerulf, Das Christiania Sihir-Becken, 1855 ; (and Tellef Dahl), Geologie des 

 Siidlichen Norwegeus, 1857 ; Veiviser, 1865 ; (and Hanan), Om Trondhjems Stifts 

 Geologi, 1875, etc. 



^ Udsigt over det sydlige Norges Geologi (1879). German ti-auslation, by Dr. 

 Gurlt (Die Geologie des Siidlicbeu und Mittleren Norwegen), Bonn, 1880. 



* W. Brogger, Paradoxides -skiferne ved Krekling, Nyt. Mag. f. Natiirvidernska- 

 berne, 187o, etc. Trondhjemke Fossiler, ibid. 1875; also Geol. Foren. Forbaud. 

 1875, 1876. 



