Drainage i)i the Adirondaeks. — Bingham. 2 1 9 
of pebbles in the basal fossiliferous conglomerate of the Cam- 
brian, it is plain that the folding in this region was terminated 
long before the Cambrian period. 
Bnt the age of the Bothnian schists seems to be susceptible 
of a still more exact determination. In the eastern portion of 
Finland is a series of folded sediments more ancient than the 
"rapakivi," but more recent than the Archean granites of the 
type of those which cut the schists of Tammerfors. Hence 
the latter are separated from the base of the paleozoic group 
by two great formations (of the systemic rank) and three im- 
mense discordances. 
They are, further, so intimately allied to the fundamental 
crystalline complex, called Archean, of the south of Finland, 
that it is absolutely impossible to hope to separate them from 
it. Therefore, their presence at several points is not at all 
surprising to those who have made investigations on this 
terrane of such rocks, existing at other places. In all cases 
the formation of Tammerfors is such that the sedimentary and 
the metamorphic nature of the true Archean schists is shown 
with the most complete evidence. 
NOTE OM TRELLISED DRAINAGE IN THE 
ADIRONDACKS. 
By Albert Perry Brigham, Hainiltou, N. Y. 
(Plate XV.) 
This brief paper may serve to suggest a problem in Ad- 
irondack drainage. In the study of the new topographic maps 
of eastern New York attention was attracted to a marked ad- 
justment of drainage in the region covered by the central and 
western part of the Elizabethtown sheet and the eastern part 
of the Mt. Marcy sheet. The district, as limited in the ac- 
companying sketch map (plate XV) traced from the sheets, 
extends fourteen miles from east to west and eleven miles 
from north to south. Its eastern edge is from five to seven 
miles west of lake Champlain and its western edge is four and 
one-half miles from the summit of Mt. Marcy, the highest of 
the Adirondack peaks. In the central and southeastern part 
of the district the summits commonly range between 1,500 
