228 Carl Fred. Kolderup. [Nr. 8 



escharoides, Catophyllum sp., some very indistinct cup-corals, and 

 some cross-sections of gastropodes. Finally in the marblein the narrow 

 isthmus between Liodden and Liøen I have found indistinct frag- 

 ments of cup-corals and what I supposcd to be a cross-section of 

 a gastropod. As may be seen from the collective list of what has 

 been found in the tracts of Hekland — Liøen, the forms found are 

 few and badly preserved. but nevertheless these finds have a con- 

 siderable stratigraphical interest, as they exhibit a complete corre- 

 spondence with the forms which are met with near Os, and 

 which in Kiær's opinion must originate with stage 5 a. From this 

 we shoukl be able to conclude that not only do the different large 

 lentil-shaped zones appertaining to the large marble-phyllite-zone, 

 dealt with in this chapter, belong to stage 5 a, but that the marble- 

 layers west of the Trengereid station must also be reckoned to this 

 very stage. 



The marbles here dealt with, which are all calcite-marbles, must 

 be described as epi-marbles according to Gkubenmanjs t 's nomenclature ; 

 some few varieties seem to approach the meso-marbles. The chief 

 part of the marble found is dark-grey and often so fine-grained 

 that, judging from the impression obtained from the surface, we 

 should in many cases conclude that we have to do with lime-stones ;. 

 less frequently we see mottled red varieties such as for instance 

 near Hisdal and in the tracts at Trengereid, or quite white varieties, 

 e. g. on Hekland farm, at Skaftaa, near the school-house at Tren- 

 gereid, and partly also near Hisdal. 



As regards the mineralogical composition, calcite must be said 

 to be quite the predominant mineral, which, according to the ex- 

 periments made, in some cases constitutes 98-99 pct. of the whole 

 rock. Together with calcite some quartz will always occur; in some 

 pure marble-varieties the quartz constitutes 1 pct., in others up to 

 some 2 pct., and in others again, as in the quartz- and zoisite- 

 rich types at the railroad N. E. of Trengereid, quartz is one of 

 the chief minerals; in this case, however, the rock cannot be re- 

 garded as marble any longer. In many varieties, especially in the 

 streaked and schistose ones, we tind folia of sericite, fuchsite and 

 chlorite as well as small crystals of zoisite and epidøte. Further- 

 more we see in some varieties plagioclase and also a coal-substance 

 (graphite or graphitoid). 



The structure is generally crystalline granuler, or if we use 

 Geubenmann's designation, granoblastic, sometimes slightly lepido- 



