174 



NEW YORK STATE MUSEUM 



Lake Vermont, 147 

 Lasiograptus bimucronatus, 93 



eucharis, 50, 51, 98. 99 

 Laurentian granite, 16, 17, 21-22, 25, 



149; analyses, 24 

 Leperditia n. sp., 47 



dermatoidea, 67 

 Lepidocoleus jamesi, 97 

 Leptobolus sp., 93, 97 



insignis, 50, 98 



walcotti, 92 

 Leptograptus sp., 91 



flaccidus mut. trentonensis, 92 

 Levis trough, 114 

 Limestones, 7, 17, 19, 20, 151-52 

 Lingula, 67 



sp.y 80 

 Lingulella (Lingulepis) acuminata, 



35, 38, 39, 42, 44 



coelata, 67 



granvillensis, 67, 72 

 Lingulepis acuminata, 34, 38, 42 

 Linnarsonia sagittalis var. taconica, 



67 



Liospira sp., 77 



Little Falls, 10 



Little Falls dolomite, 31, 32, 39, 40, 

 42-45, 58, 59, 60, 61, 62, 137, 139, 

 141, 149, 150, 155, 161, 165 



Lonchocephalus calciferus, 42 



Lonely lake, 15 



Long Lake quadrangle, 28 



Lorraine formation, 52 



Lowville limestone, 138, 139 



Lyrodesma schucherti, 97 



McGregor fault, 54, 60 



Maclurea, 76 



Magnetite, 21, 28, 29 ' 



Martinsburg shale, 51 



Matherella saratogensis, 42 



Matthewia variabilis, 42 



Mechanicsville, 91 



Merrill, F. J. H.. cited. 76 



Mesograptus mohawkensis, see Dip- 

 lograptus (Mesograptus) mo- 

 hawkensis 



Mesograptus putillus, see Diplograp- 

 tus (Mesograptus) putillus 



Mesozoic history, 143-45 



Mettawee slate, 69 



Mica, 18, 20, 21, 23, 27 



Microcline, 23 



Microdiscus connexus, 67 

 lobatus, 67 

 speciosus, 67 



Microperthite, 2^, 24 



Middle Falls, 75, 77, 78, 152 



Miller, W. J., acknowledgments to, 

 6 ; part of Saratoga quadrangle 

 mapped by, 5 ; report on Broadal- 

 bin quadrangle, 5; cited, 27, 31, 



34, 35, 39, 47, 53, 54, 56 

 Mineral springs, relations to shale 



belt, 165-67 

 Mineral waters, 152-64 

 Mohawk lowland, 10, 114 

 Mohawk region, faults, 54-57 

 Molding sand, 148 

 Moordener kill, 82 

 Moraines, 13-14 

 Moreau pond, 15 

 Morley, E. W., cited, 24 

 Moses kill, iii 

 Mt McGregor, 26, loi 

 Murchisonia sp., 42 



cassina, see Hormotoma 

 (Murchisonia) cassina 



Nassau beds, 70 

 Normanskill fauna, 91 

 Normanskill grit, 86-91, 152 

 Normanskill shale, 49, 66, 72), 84-93, 



102, III. 113, 142, 165 

 North Milton, 46 

 Northumberland volcanic plug. 115- 



35. 107. 149. 163 



Obolella, 67 



crassa, 72 

 Obolus prindlei, 72 

 Olenellus, 67 



sp., 72 

 Oligoclase, 18. 23, 24 

 Olive grit, 67, 69, 71 

 Olivine, 29 

 Oolite, 39 

 Ophileta. 78 



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