334 



INDEX. 



Brine, Table of analyses of, 186 



British Fort (old) , Drummond's I. , 55 



Brown. A. J., shaft of, at Flushing, 119 



Brown ^s Quarry, Drummond's I., 55 



Bryozoa, 69, 101 



Burnt Cabin Pt., 82 



Burt, William A., cooperating with Dr. 



Houghton , 10 



Butterworth's Salt Well, 74, 76, 90, 93 



Statistics of, 148, 168 



Oalamites, 72, 113, 114, 117 



Calciferous Sandstone, 51 



Caledonia, Shiawassee Co., 122 



Calhoun Co. , 76, 81, 82 



Campement d'Ours, 50 



Cannon , Kent Co. , 98 



Canwright's well, Coldwater, 77 



Carboniferous Limestone, 98 



distribution of, 98 et seq. 



Geological equivalents of, 103 " 



Pateontology of, 103 " 



Thickness of, 153 



Cardvwm, 85 



Carp Lake, 72 



Carter's Quarry, 69 



Caryophyllia duplicate, 104 



Cass River, 82, 89 



Chceietes lycoperden, 53 



Chalcedony, . 66 



Challis, " Prof. ," 95, 119 



Charity Islands, 101 



Chazy Limestone, 51 



Cheboygan Co., 61 



Cheboyong Creek, Huron Co., 100, 102 



Chemung Group in Mich. , 136 



Cherty concretions, 66 



Chesaning, Saginaw Co., 124 



Chimney Rock, 60 



Chocolate river, 49 



Clumetes, 65, 77, 84, 85 



Mickigwiensis, 87 



Smtihii,. 119 



Christiancy, Hon. I. P., aid received 



from , 32, 64 



Christiancy 's Quarry , 64, 66, 67 



Cincinnati, Geological position of, 44, 54 



Cladopora sp ? 105 



Clark, G \orge, aid received from, 22 



Clark, Miss Mary, Botanical information 



from, 37,243 



Cliff Limestone, 58 



Clinton Co., 114 



Clinton Croup, 54, 63 



Clymmia, 75, 80, 82, 85, 87 



Coal, reported oa by Dr. Houghton and 



assistants, 89 



Goal; divi lei into " Upper" and "Lower" 



by Dr. HougMqp arid assistants, 89 



Coal, misguided explorations for, .....23, 177 



in the Huron Group, 74 



hints on the- search Cor, 157 



qualities of, at Woodville mine, .110, 161 



at Barry, 117, 159 



at Coruuna, 122, 161 



evidences of proximity to, 130, 157 



prices of , at Barry, 159 



operations for, at Woodville, 159, 160 



at Corunna, 161 



consumption of, in Mich. , 162 



Coal, Cannel, analysis of, 159 



Coal Creek, Eaton Co., 121 



Coal Measures, description of in Mich.,. . .114 



contain brine, 97 



geographical extent of 114 



Coal Measures, general section of, 126 



never continuous from Ohio to Mich. ,.186 



thickness of, 155 



Coke, from Michigan coal, 116, 161 



from Peat, 195 



Coldwater, Branch Co., 76, 77 



Conglomerate of L. Superior, 15 



on Sulphur I. , 60 



at base of Helderberg Group, 60 



at base of Marshall Group, 80 



Coniferce, 68, 296 



Copper Bay, 52 



Copper, Native, Geological position of,. 49, 80 



found iu Marshall Sandstone, 80 



Copper Ores, Geological position of, 49 



Corunna, Shiawassee Co., 122,126 



See, also, "Coal." 



Coscinium, 105 



County Surveyors, Circular to, 28 



Crawford's Marble Quarry, 61,63,64,68 



Crawford, Thomas, aid received from,. .. 38 



Cryptoceras, 85 



Cummins, James, 65 



Currier, A. O., aid received from, 82 



Cuyahoga river, Ohio, 78 



Cyathocrinidas, 69 



Oyathqphyllida, 59, 64, 69, 101, 102 



Cyathophyllum fungites, 103 



sp? 104 



Cypricardites ventricosus, 62 



sp? 62 



Cyprinoid shells in Marshall Sandstone,.. 80 



Cyrtia, 65 



Oyrtoceras, 85 



Cytherina, 55 



3D. 



Dalmannites caTlicephalus , 32 



Dead Creek, Iosco Co., 96 



De Camp, Dr. , aid received from, 32 



Deep boring for coal, statistics of, 161 



Deer Creek, Ottawa Co., 84 



Delta, Eaton Co. , 124 



Denudation of strata, 41 



Deposition of strata, 41 



Depositories of specimens of the survey,. . 36 

 Descriptions of new species of shells, .238, 240 



Detroit, Huron Group at, 76 



Depth of Drift at, 129 



Artesian well at, 146 



Detroit and Milwaukee Railway Co. , coal 



mining of, '. 122 



Devonian System, 60 



Dickinson's Quarry, 54,55 



" Diluviums;" -.. 12 



Dip of strata, what and how caused, 43 



Dislocat ion , at Mackinac, 61 



at Pt. aux Barques Light-house, 75 



Disturbance of strata, 41 



, Mr. , Zoological Assistant 1359,. . . . 25 



Don Tooth Spar,..'. 66 



Dolomite of Drummond's I. , 56 



Douglass, C. C, Assistant State Geo'ogist, 7 



Drift Forces, continuity of, 128 



Drift materials and phenomena, 12T 



Drift, modified, 129 



Drummond's I., 53,56 



E. 



Eastman villo, Ottawa Co., 84 



East Saginaw, Salt explorations at, 24 



Depth of Drift at, 129 



East Saginaw Salt Wells,. . . .90, 102, 114, 124 



Communication on geology of, 25 



Statistics of , 161 



Eaton Co., 97,114 



