ILLUSTRATIONS Vll 



Collie: Page 



Figure 1 — Cliippewa point and the Apostle {jroup of islands 108 



" 2 — History of Clie(iii;une»;on bay 207 



Ami : 



Figure 1 — Geological map of portions of Pictou and Antigonish counties, 



Nova Scotia 302 



Hall: 



Figure 1 — Sketch across a typical lava flow, Chengwatana series o28 



" 2 — Concentric weathering of Chengwatana series o29 



*' 3 — Diagrammatic sketch of fault-line vents from which diabase 



possibly flowed 33G 



Hall : 



Figure 1 — A grain of albite feldspar 3G0 



** 2 — Hornblende gray wacke 303 



** 3 — Hornblende-schists 304 



Le Roy: 



Figure 1 — Map of Rigaud mountain 379 



" 2— Section from Rigaud to Grenville 393 



FOERSTE : 



Figure 1 — Silurian outcrops on western flank of Cincinnati anticline, 



Tennessee ♦ 398 



** 2 — Sections of Tennessee Devonian rocks 400 



" 3 — Sections showing variations in thickness of Tennessee Silurian 



rocks 402 



" 4 — Additional sections of Tennessee Silurian rocks 409 



'* 5 — Rapid thinning incident to unconformity . 410 



" 6 — Sketch map across Cincinnati anticline along Cumberland 



river, Kentucky 422 



" 7 — Sections of Chattanooga black shale and Silurian rocks 423 



" 8 — Southern limit of Devonian limestone 424 



Davis : 



Figure 1 — Block diagram of river terraces 484 



(45 plates, 28 figures.) 



