132 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
and lie at all angles, consist principally of red and gray granites and 
quartz-grits resembling those of the Gaisa formation.” No striated 
blocks were seen but on account of the hardness of the adhering 
matrix Strahan had time to examine only two or three specimens. 
“The boulder rock rests on regular bedded sandstone of the usual 
type and weathered back so as to expose several square yards of a 
remarkably even surface of rock. The platform is not only smoothed 
but conspicuously and characteristically striated and the striae can be 
followed under the boulder rock. The striae unquestionably cut into 
the rock independently of any structure possessed by the latter and 
are in all respects glacial markings.” The age of these rocks is 
uncertain. They may be Cambrian or older or as late as the Triassic. 
“Tn general lithological character they belong to the type of great con- 
tinental formations.” 
In southwestern Norway, on the islands and peninsulas near the 
Sogne Fiord, there are some conglomerates that have been made the 
object of a special study by Helland, whose paper was kindly trans- 
lated for the writer by Mr. B. Palsson. This formation varies in 
thickness from 1,000 to 6,000 feet and is distributed in four entirely 
separate districts, which have a total area of 1,140 square kilometers. 
The conglomerates rest (Helland, p. 25) on slates in open synclines 
which are tilted westward. The southern district consists entirely 
of conglomerate, the northernmost of sandstone and the intermediate 
districts of both conglomerate and sandstone. The pebbles are of 
many kinds of material and are sometimes so angular that the forma- 
tion is almost a breccia. The size and character of the pebbles and 
the characteristics of the matrix are variable in the different districts 
and in the same district (ibid., p. 30). The materials vary in size from 
microscopic particles to masses over 1.5 meters in length and a little 
over a meter in breadth (ibid., p: 35). The conglomerate is not strati- 
fied. Pebbles of the same size are seldom together; on the contrary, 
materials of different size, character and specific gravity lie side by side 
(ibick, p. 38). The matrix (ibid., p. 45 et seq.) is either slaty or sili- 
cious and is variable in quality and abundance. In some places there 
is very little of it while in others it constitutes about one-third of the 
rock. The slaty matrix consists of clastic fragments of quartz, feld- 
spar, and other minerals, together with a fine paste of amorphous 
matter containing some greenish crystalline needles. In the silicious 
matrix the clastic fragments are larger and much more conspicuous 
and the paste appears only as a little rim around the fragments. The- 
paste, however, has crystallized and contains chloritic minerals and. 
