﻿280 
  

  

  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Isochllina, 
  218'. 
  

  

  cylindrica, 
  218''. 
  

  

  Lacustrino 
  period, 
  57''-65^ 
  

  

  Lake 
  basi::s/orig'n, 
  5ol 
  

  

  Lake 
  leglon, 
  tilting 
  cf 
  the 
  land, 
  65^ 
  

  

  Lakes, 
  maps 
  of 
  Great 
  lakes, 
  61, 
  62. 
  

   See 
  also 
  names 
  of 
  lakes, 
  as 
  

   Iroquois, 
  Ontario. 
  

  

  Lameilibranch^ata, 
  206^-10". 
  

  

  Lampsilis, 
  248^-49^ 
  

   elxipsiformis, 
  249^ 
  

   rectus, 
  248°-4qI 
  

  

  Larviformia, 
  153*^-55*. 
  

  

  Laurentian 
  glacier, 
  thickness, 
  SS*-56l 
  

  

  Laurentian 
  old-land, 
  composition, 
  

   31'. 
  

  

  Laurentian 
  region, 
  diagrams 
  show- 
  

   ing 
  type 
  of 
  drainage 
  existing 
  in, 
  

  

  44, 
  45- 
  

   Laurentian 
  river, 
  49^ 
  

   Laurentide 
  mountains, 
  26*, 
  36". 
  

   Lawson, 
  cited, 
  s^'. 
  

   Lecanocrinus, 
  i6o\ 
  

  

  macropetalus, 
  160". 
  

   Leperditia, 
  218^-19*. 
  

  

  scalaris, 
  2i9\ 
  

   Leptaena, 
  i8o\ 
  

  

  depressa, 
  180*. 
  

  

  patenta, 
  182'". 
  

  

  rhomboidalis, 
  loi*, 
  180*. 
  

  

  sericea, 
  183'. 
  

  

  striata, 
  I82^ 
  

  

  subplana, 
  184". 
  

  

  transversalis, 
  183*. 
  

   Lesley, 
  J. 
  P., 
  cited, 
  257^; 
  mentioned, 
  

  

  i8\ 
  

   Letson, 
  E. 
  J., 
  Post-pliocene 
  fossils 
  of 
  

  

  Niagara 
  river 
  gravels, 
  238-52. 
  

   Leverett, 
  Frank, 
  cited, 
  256^ 
  57"; 
  

  

  mentioned, 
  6'. 
  

   Lichas, 
  224^-25*. 
  

  

  boltoni, 
  225"; 
  illus 
  facing 
  p. 
  225. 
  

   Lichenalia, 
  i76\ 
  

  

  concentrica, 
  loi^, 
  176^ 
  

   Life 
  history 
  of 
  Niagara 
  Falls, 
  55^- 
  

  

  85^ 
  

   Limestone 
  beds, 
  28°, 
  29^ 
  

   Lim.estone 
  cliff, 
  29^. 
  

   Limestone 
  lenses 
  of 
  the 
  Clinton, 
  

   99*^- 
  102'. 
  

  

  Limestones, 
  formation, 
  124^-26^. 
  

   Limnaea, 
  243^-441 
  

  

  catascopium, 
  244". 
  

  

  columella, 
  244'. 
  

  

  decisa, 
  243^ 
  

  

  desidiosa, 
  244^. 
  

  

  heterostropha, 
  245\ 
  

   Lingula, 
  88^ 
  ii6\ 
  i78\ 
  

  

  cuneata, 
  89", 
  92^ 
  178'. 
  

   Lioclema, 
  i6s'-66'. 
  

  

  aspera, 
  i65^-65'. 
  

  

  fiorida, 
  165*. 
  

   Liopteria, 
  2o8\ 
  

  

  subplana, 
  2o3\ 
  

   Lockport 
  limestone, 
  ^,3°, 
  34", 
  105®- 
  

  

  13''; 
  illus. 
  facing 
  p. 
  94. 
  

   Logan, 
  cited, 
  36*, 
  36"; 
  mentioned, 
  6'. 
  

   Lorraine 
  shales, 
  33^. 
  

   Lowlands, 
  formation, 
  55". 
  

   Luna 
  falls, 
  illus. 
  facing 
  p. 
  10, 
  38, 
  

  

  54- 
  

   Luna 
  island, 
  II^ 
  

   Lundy's 
  Lane, 
  battle 
  of, 
  I3^ 
  

   Lyell, 
  Charles, 
  cited, 
  257^ 
  82'; 
  men- 
  

   tioned, 
  6", 
  18'. 
  

   Lyriocrinus, 
  156^-5?^. 
  

   dactylus, 
  i56"-57l 
  

   Lyriopecten, 
  2o8'^-9\ 
  

  

  orbiculoides, 
  2o8*-9\ 
  

  

  Maid 
  of 
  the 
  mist, 
  io\ 
  12^ 
  14^ 
  

  

  Manlius 
  limestone, 
  29*, 
  33', 
  116'- 
  17*, 
  

   128^; 
  and 
  Onondaga 
  limestone, 
  

   unconformable 
  contact, 
  ii8\ 
  

  

  Map, 
  geologic, 
  22\ 
  

  

  Marcellus 
  shale, 
  30^ 
  

  

  Marcou, 
  Jules, 
  cited, 
  257'. 
  

  

  Margaritana 
  marginata 
  var. 
  trL:nca:a, 
  

   25a'-5i'- 
  

  

  Marine 
  organisms, 
  in 
  Great 
  lakes, 
  

   64'. 
  

  

  Mattawa 
  river, 
  62^ 
  

  

  Maw, 
  George, 
  cited, 
  257'_. 
  

  

  Medina 
  sandstones 
  and 
  shales, 
  26; 
  

   33', 
  34\ 
  60', 
  87'-95'; 
  illus. 
  facing 
  p. 
  

   86, 
  92, 
  94; 
  fossils, 
  123*, 
  232-37. 
  

  

  Me'.ina 
  livescens, 
  239®-40^ 
  

   niagarensis, 
  240'. 
  

  

  Merrill, 
  F. 
  J. 
  H., 
  cited, 
  257'. 
  

  

  Michigan, 
  lake, 
  rising 
  of 
  waters, 
  65^ 
  

  

  