234 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 
hornblende gneiss with abundant lenses of segregated hornblende and 
biotite. The strike varies from N. 15° W. to N. 30° W., and averages 
N. 25° W. From its trend, the Tallek was seen to be a strike-valley. 
The same may be said of the valley of the Kogarsuk, which mouths 
just west of Kipsimarvik. At the Post, thin sheets or dikes of eruptive 
rock cut the gneiss. They are light purplish-gray in color, and recall 
the anorthosites of the south. Gneiss similar to that at Kipsimarvik 
composes the northern and western slopes of the Kutyautak. 
At the head of the Tessyuyak, the variegated cliffs proved to be in 
largest part made up of badly weathered ferruginous and silicious schists, 
graphite gneiss, and graphite schist. With these was associated in con- 
siderable development a peculiar breccia of angular quartz fragments em- 
bedded in a black corneous matrix. The graphite occurs abundantly in 
the form of disseminated flakes. No large mass of the pure mineral was 
discovered in the short time at our disposal. That such a discovery is 
possible appears from the fact that a rounded piece of pure graphite 
measuring four by five inches has been found at the foot of the talus 
near the great alluvial fan ; it is now in the possession of Mr. Ford. 
THE GENERAL STRUCTURE OF THE CoasTAL BELT. i 
From the foregoing account, it may be seen that, in the line of the long 
coastal section from Belle Isle Strait to Nachvak, Labrador is underlain 
by the crystalline complex. If, now, a review is made of the most 
important structural element, strike-direction, one cannot but conclude 
that the Archean shield is rather definitely framed on this border, and 
that the average direction of the coast-line is related to the tectonic 
trend of the ancient mountain-system of which the Labrador plateau is 
a diminished remnant. (Plate 11, Table I.). A similar parallelism of 
structural trend and coast-line probably exists along the high mountain- 
belt of eastern Baffin Land as far as Lancaster Sound.’ It should be 
stated that the brief table and the map do not represent the only evi- 
dence for this law as expressed in Labrador. Very often the general 
attitude of the crystalline schists could be determined from the schooner 
when under way, although no opportunity could then present itself for 
accurate measurement of the strike. The impression thus gained is 
sufficient to warrant our regarding the fidelity of the structure to a 
general N. W.-S. E. trend as of a higher order than is shown in the table 
or in the sketch-map. On the other hand, it is evident that no record 
1 E. Suess, La Face de la Terre, 1900, vol. 2, p. 47. 
