INDEX 



Acanthodus pristis, 56. 

 Ambocoelia, 60. 



umbonata, 68. 

 American Blnestone Co., 61. 

 Atrypa aspera, 68. 

 Aulopora, 62. 



annectens, 51, 54. 

 Avon lake, 80, 81. 



Bactrites aciculum, 50, 52, 54, 60. 

 Belfast quadrangle, 68. 

 Belfast-Fillmore lake, '^(i, 81. 

 Bibliography, 44-45. 

 Bluestone, rock exposures at, 65. 

 Bluestone quarries, 61. 

 Buchiola lupina, 61. 



retrostriata, 51, 52, 54, 59, 61, 66. 



speciosa, 57. 

 Buck run ravine, 53, 55, 56, 57. 

 Byersville, reck exposures near, 59, 



Camarotoechia sp., 68. 



Canaseraga valley, 55, 57, 59. 



Caneadea creek, 68. 



Canyons, 81-83. 



Cashaqua creek, 55, 56, 57, 59. 



Cashaqua shale, 46, 47, 48, 49, 53- 



55, 65. 

 Castile, rock exposures near, 62. 

 Cataracts, 81-83. 

 Catlin, rock exposures at, dy. 

 Chernung fauna, 62. 

 Chemung group, 66-68. 

 Chemung sandstones and shales, 



46, 48. 

 Chonetes, 60. 

 Cladochonus, 61. 

 Clarke, John M., cited, 45, 50, 52, 



53, 54, 55, 64. 



Classification, 46-47. 

 Crinoid stems, 62. 



Dalton, rock exposures near, 65. 



Dana, Lake, 80, 81. 



Dansville and Genesee valleys, 



junction of, 75. 

 Dansville lake, "jy, 81. 

 Detrital filling of the valleys, 84. 

 Dip, 68-69. 



East Koy creek, 67. 

 Entomis serratostriata, 60. 



variostriata, 60. 

 Erie, Lake, 54, 55, 62. 

 Erin, rock exposures at, (ij. 

 Euthydesma subtextile, 61. 



Fairchild, Herman L., Pleistocene 

 History of the Genesee Valley 

 in the Portage District, 70-84. 



Fall brook ravine, 49, 50, 51, 52, 59. 



Fillmore, rock exposures near, 65. 



Flume, 60. 



Formations, description of, 47-69, 



Fucoides graphica, 57, 61. 

 verticalis, 46, 61, 62. 



Gardeau flags and shale, 47, 48, 5&- 

 6r, 62. 



Gardeau Flats, 56, 57. 



Gardeau group, 46, 55. 



Genesee Falls, 47. 



Genesee river gorge, 47, 61; diver- 

 sions, 71-75. 



Genesee shale, 46, 48-50, 68. 



Genesee valley, 65; in the Portage 

 district, pleistocene history, by 

 Herman L. Fairchild, 70-84; 

 junction with Dansville valley, 

 75- 



