316 Correspondence. 
catenularia,Cyathophyllumf Syringophyllum and gasteropods resembling 
Murchisonia and Subulites. In the northern phyllite zone occur 
quartzose sandstones and conglomerates. The groundmass of one of 
the conglomerates is greenish chlorite. This, as well as the pebbles, 
is penetrated by hornblende crystals evidently epigenetic. This zone 
contains a great abundance of fossils, including Graptolites. They occur 
in a very lustrous shale of light gray color appearing to consist chiefly 
of muscovite. The rock contains weathered balls of limestone with 
faint traces of chain corals. In the shale occur also, Calymene, Phacops, 
Brachiopods and other forms indicating the horizon of the Upper Silur- 
ian. The pebbles of the conglomerates are always elongated ellipsoids 
and lie parallel with the strike. 
6. Chloritic sparagmite, composed of small fragments of greenish, 
small-grained rock particles difficult to determine,, and full of chlorite 
and black mica. Sometimes the rock has a gneissic appearance ; at 
others the fragments are so large as to present a perfect conglomerate. 
7. Calciferous gneiss. This occurs in proximity to the saussurite- 
gabbro. 
8. Saussurite-gabbro. The structure of some portions resembles 
the Riesenflaserstructur of the Germans. It consists of lenses of gabbro 
of irregular grain or parallel structure. The lenses are surrounded by 
amphibolite schist. Miueralogically it consists of saussurite and 
greenish diallage. It embodies in places, fine grained, sometimes 
slaty, feldspar-bearing hornblende rock, and in one I'egion becomes 
beautifully stratified. The latter variety is intersected by veins, and 
contains also, considerable masses of unstratified saussurite-gabbro. 
But the interruptions are not accompanied by displacements of the 
strata. Portions of the gabbro are rich in olivine. 
9. The crystalline schists of Lysekloster appear somewhat transi- 
tional between the dioritic and hornblendic schists and a peculiar 
gneiss. 
In the neighborhood of Trengereid are found marbles, polygenous 
conglomerates as at Osoren, (occurring in six outcrops) several varie- 
ties of gneiss, quartzite, mica schist and Flaser-gabhro. In the marble 
are ?encrinite stems and Chain-coral. In the immediate vicinity of 
Bergen, the same varieties of rocks occur. Over quartz schist lies red- 
dish and grayish gneiss. In the vicinity is a crumpled porphyritic 
gneiss. The conglomerate consists of a quartziferous mica schist rich in 
chlorite, and strewn with peddles of porphyritic gneiss-granite and. 
other varieties of gneiss and granite. 
In the Ulriken district, gneisses are the prevailing rocks ; but the 
peculiarities of these need not here be mentioned. 
The regions described exhibit the phenomena of metamorphism in 
a characteristic and striking development. It is beyond controversy 
that the marbles, phyllites and quartzites have had a sedimentary ori- 
gin. The Os'gneiss is also, with little possible question, originally 
sedimentary. Dr. Keusch expresses the opinion that the gneisses 
were originally formed of loose material, (gravel of granite or gneiss) 
