JOHAN KIÆR. M.-N. Kl. 



In recent years the Holmia fauna at Tømten, and particularly Holmia 

 Kjerulfi, has often been discussed in literature, but only a few of these 

 works are of any great interest in connection with the present treatise. 

 Mention should be made of Moberg's interesting and important work of 

 1899, "Sveriges älsta kända Trilobiter" ^ (The oldest known Trilobites of 

 Sweden], in which we also find a number of significant remarks concerning 

 Holmia Kjerulfi Lnrs., and of Walcott's admirable survey of Olenellus 

 and kindred forms in his work (1910): "Olenellus and other Genera of 

 the Mesonacidae"-, which is equally notable for its wealth of new facts, 

 as for its excellent descriptions and illustrations, and its fruitful impulses. 



One or two years later the same author made the last important con- 

 tribution to our knowledge of the Holmia fauna at Tømten, in his magni- 

 ficent monograph on the Lower Cambrian brachiopoda^. For this work 

 Walcott had considerable material from Tømten, part of which was sent 

 to him from the Paleontological Museum of Kristiania University, and part 

 collected for him by v. Schmalensee. 



On the basis of this material Walcott described the following 

 brachiopoda from the Holmia zone at Tomten : 

 Lingulella sp. 



Obolella Mobei'gi Walcott. 

 Obolella (Glyptias) favosa Lnrs. 

 Acrothele bellapunctata Walcott. 



The works that deal with the Holmia shale at Tømten from a geo- 

 ogical point of view will be discussed later on. 



The Geology of the Locality at Tømten. 



The geological conditions at Tomten and in the immediate neighbour 

 hood of the same locality were described, as we have mentioned in our 

 historic review, as early as by Th. Kjerulf in several of his works. The 

 marked inversion north of the district with Holmia shales, was indicated 

 by him as early as the year 1855-^, and plays a considerable part in his 

 later studies of the geology of that region. Thus in several parts of 

 "Sparagmitfjeldet"^ he makes theoretic reference to this region, and illu- 

 strates it by a number of profiles, which however are very schematic. 



1 Geol. Foren. Forhandl. Bd. 21. 



2 Smiihson Misc. Collections, Vol. 53, No. 6. 



3 Cambrian Brachiopoda. Unit. States Geolog. Survey. Monographs LI, 1912. 

 * Nyt Mag. f. Naturv. Vol. 9, p. 234. 



° Universitetsprogram, 1873, p. 48 and 72. 



