270 THE TACONIC QUESTION IN GEOLOGY. 
73. His section of the series in King’s Mountain; 74. The underlying rocks; the upper limestone ; 75. 
Thickness of the series ; supposed organic remains; 76. Mineralogical characters; gold ; 77. Magnetic and 
specular iron-ores ; 78. Limonites; their origin; 79. Wurtz on the King’s-Mountain series; ores of this 
horizon ; its importance; the Itacolumitic series Lower Taconic; 80. Lower Taconic rocks in New Jersey; 
81. East of the Green Mountains in Vermont and Quebec; 82. In Maine and Rhode Island ; 83. In New 
Brunswick; St. John section; 84. Its relations to Menevian and Laurentian; 85. Taconic in Hastings 
county, Ontario; 86. Organic remains in the Hastings rocks ; 87. Taconic in northern New York; 
studies of Brooks; 88. Relations of these rocks to sub-aérial decay; 89. Animikie group of Lake 
Superior; probably Lower Taconic; 90. Emmons on Taconic in Michigan; 91. Powell on the pre- 
Cambrian Grand-Canon group; 92. The Lower Taconic called Taconian ; its relations to eozoic and 
to paleozoic time; Supposed organic remains in Keweenian, and origin of its rocks, (foot-note.) 
Caarryr V.—The Upper Taconic or First Graywacke—93. Mather on this Graywacke; 94-95. Emmons proposes to 
unite it with the Taconic, and calls it Upper Taconic; 96. Its extension southward into Virginia; 97. 
Its development in Pennsylvania; 98. The Green-Pond Mountain range in New Jersey; 99. Its strati- 
graphical relations ; the Peach-Bottom slates in Pennsylvania; 100. The Upper Taconic east of the Hud- 
son; section in Washington County, New York; its apparent inversion throngh faults; 101. The 
importance and frequency of such geological accidents ; 102. The Red Sandrock of Vermont. 
Caaprer VI.—The Upper Taconic in Canada.—103. Logan on the contorted rocks near Quebec; he calls them, after 
Emmons, Hudson-River group and Oneida sandstone; 104. Emmons subsequently adopts Eaton’s 
view of the age of these rocks; 105. The trilobitic fauna of Point Levis, and Logan’s change of view; 
106. The Quebec group; Sillery and Levis; the series inverted; views of Logan.and of Billings ; 107. 
Conflict of opinion as to horizon of the Hudson-River group; 108. Juxtaposition of the two Graywacke- 
series; 109. Stratigraphical breaks; 110. The Second Graywacke near Ottawa; 111. Distribution and 
varying thickness of Trenton limestone; 112. Hall on the Hudson-River group; 113. Its composite 
character ; 114. Logan on a supposed great fault between the Trenton and the Quebec group; 115. 
Logan on the Quebec group in the Hudson valley ; 117. The disappearance of the Trenton limestone ; 
stratigraphical breaks; Silurian limestones near Montreal; their distribution; 118. Section of Cam- 
brian and Ordovician in Vermont; 119. Ordovician in Quebec; beds at Farnham ; their supposed Pots- 
dam age; Ordovician among the crystalline schists; 120. The true signification of the Hudson- 
River group: it included Eaton’s Sparry Limerock ; 121. Its relations to the Red Sandrock; 122. The 
relations of the Quebec group; the inversion of this by Logan; 123-124. Arguments therefrom for the 
Cambrian age of the Huronian schists and Taconian marbles ; 125. Logan refers the Keweenian of Lake 
Superior to the Quebec group, and the Animikie to the Potsdam. 
Craprer VII.—Paleozoic History of Northeastern America.—126. Boundaries of the Cambrian sea; pre-Cambrian 
lands of North America; 127-128. Difference in Cambrian sediments near the Adirondacks and along the 
Green Mountains; deposition of Cambrian Graywacke: 129; Deposition of Potsdam and Calciferous 
subdivisions ; 130. History of the Chazy limestone; 131. The Ordovician sea; 132. The Silurian sea; 
various views of the age of Taconian marbles ; 133. Supposed paleozoic age of Green-Mountain rocks ; 
the view untenable; 134. Pre-Cambrian age of these and other crystalline rocks ; 135. Movements of 
elevation in paleozoic time ; their relations to decay and erosion ; thermal waters and local alteration. 

