141 

 ILLUSTRATIONS. 



Photographs. 



PAG Li 



Corundum crystal, natural size. Craigmont, Ont Frontispiece 



Laurentian peneplain, looking east from Fort Stewart, 



township of Carlow 1 1 



Interbanded crystalline limestone and granular amphibolite 



Wellington road, lot 6, Con. III. Chandos township. 21 



Interbanded crystalline limestone and granular amphibolite, 



Wellington road, lot 6, Con. III. Chandos township. 22 



Weathered surface of feather amphibolite, township of 



Wollaston 25 



Limestone passing into pyroxene gneiss and amphibolite, 

 cut by granite. Southern border of Glamorgan bath- 

 olith, Maxwell's Crossing 30 



Monmouthite, lot II, Con. VIII. Monmouth township. 

 Nepheline (grey) with subordinate albite (white) and 

 hastingsite (black) 62 



Amphibolite resulting from alteration of limestone, cut by 

 pegmatite. Eastern border of Glamorgan batholith 

 near Bear lake 72 



Nepheline syenite pegmatite, showing characteristic weather- 

 ing, from lot 30, Con. IV. Glamorgan. Nepheline with 

 albite (standing out on weathered surface). The 

 cavities in the surface of the nepheline are caused by 

 the weathering out of calcite 74 



Pusey's iron ore. Glamorgan, lot 35 of Con. IV (X 19 

 diam. Pyroxene individuals enclosed in iron ore. 

 About each pyroxene there is a narrow border of 

 hornblende 75 



Nepheline syenite from lot 32, Con. VI, Glamorgan town- 

 ship, showing biotite, nepheline and microcline, with 

 two included grains of calcite 77 



Nepheline syenite showing regional foliation, near York 



River bridge, lot 13, Con. XII. Dungannon township. 80 



Dyke of nepheline syenite pegmatite, cutting nepheline 

 syenite parallel to the foliation, lot 25, Con. XIV. 

 Dungannon township 82 



Corundum enclosed in muscovite ' red syenite. ' Just west 

 of Blue Mountain, Methuen, Ont. X 56 diam. Bet. 

 crossed nicols 93 



Photomicrograph of an asbestos vein, showing the irregular 

 nature of the magnetite parting, and the contact of the 

 vein with the serpentine wall-rock. X 14; crossed 

 nicols 112 



Photomicrograph of chromite ore showing intergrowth of 

 two varieties, — black opaque iron and chromium-rich 

 variety, showing black; and brown, translucent, magne- 

 sian variety, showing mottled. The white streaks are 

 glare from films of inclosed serpentine. X 55 115 



Barite vein in Ordovician limestone 129 



Contact of Ordovician limestone and Pre-Cambrian gneiss, 



Dead Man's bay, Kingston 135 



Tree-like concretions in sandstone near Kingston Mills. . . . 137 



