GNEISS

401. .1 Contorted gneiss, shore of Ottawa River, Canada.
401. .2 Boulder of contorted gneiss, Amherst, Massachusetts.
401. .3 Pre-cambrian gneiss cutting Precambrian granite. Man is on granite; contact cuts gneiss squarely beneath foreground patch of soil. Kingston, Ontario. All hill and valley here shown are Pre-ordovician, disclosed by removal of earlier Paleozoic limestone. Slide 481.B.3 and 4 are at water level below dead tree.

MARBLE

407. .1 Marble flowage effects produced by metamorphism. Georgian Bay, near Honey Harbor, Ontario.

SLATE AND SLATEY CLEAVAGE

409. .1 Anticlinal fold. Axis dip and cleavage dip to west; beds thicken at summit; Castlemaine, Victoria.
409. .2 Slatey cleavage and its relation to bedding planes; 2 miles south of Walland, Tennessee.
409. .3 Hill showing cleavage in granite. North side of Deep Spring Valley. Inyo County, California.
409. .4 West end of ridge, giving nearer view of granite. Same locality as preceding slide.
409. .5 Diagram of pure shortening, after Van Hise.
409. .6 Diagram showing the development of fracture cleavage, after Van Hise.
409. .7 Block showing development of fracture cleavage, after Van Hise.