276 PETROLOGICAL ABSTRACTS AND REVIEWS 
melilite-basalt, and (6) extrusives related to monchiquites and lampro- 
phyres. For one of the latter, consisting of small biotites in a cement 
of analcite, which in sections from farther down is apparently nephelite, 
the name bermudite is suggested. 
POWERS, SIDNEY, and LANE, ALFRED C. ‘‘Magmatic Differentia- 
tion in Effusive Rocks,” Bull. Amer. Inst. Min. Eng., 1916, 
535-48, figs. 4. 
From a series of drill cores taken from the Triassic basalt flows of 
Cape d’Or, Nova Scotia, the authors have had thin sections and chemical 
analyses made from material taken at different depths. They found 
that there is a concentration of the leucocratic, feldspathic constituents 
at the top of the flow, a slightly greater percentage of augite in the center, 
and of feldspar near the base. Further, there is a large amount of glass 
at both top and bottom, but more at the top, a rather uniform quantity 
of iron ores throughout, and a certain amount of olivine only at the 
top. The top and bottom of the flow were quickly chilled, and contain 
almost equal amounts of feldspar and augite. They probably show the 
original composition of the magma. With respect to the grain, it was 
found to differ in various places in thick flows. It is coarsest just below 
the center where the cooling was slowest, and more or less glassy at 
top and bottom. ‘The specific gravity was found to be greatest just 
below the center, least at the top, and of intermediate value at the base. 
Powers, SIDNEY. ‘‘The Geology of a Portion of Shelburne Co., 
Southwestern Nova Scotia,” Trans. Nova Scotian Inst. Sct., 
XIII (1915), 289-307, figs. 3. 
Granites, quartz-diorites, and aplitic granites, intruded into 
sediments during Middle Devonian diastrophism, produced extensive 
contact-metamorphism, staurolite-schist being developed ten miles 
from the nearest granite outcrop. Two analyses, computed from the 
rock mode, are given. 
QUENSEL, P. D. ‘“‘Geologisch-petrographische Studien in der 
patagonischen Cordillera,” Bull. Geol. Inst. Upsala, XI (1911), 
1-114, figs. 27, pls. 4, map 1, bibliography, analyses. ; 
This paper gives the results of a remarkable reconnaissance journey 
taken along the Patagonian Andes from north to south by Doctors 
