INDEX 



Page numbers referring to descriptions of fossils are printed in black face type. 



Acidaspis crossota, 51, 52, 119 



trentonensis, 62 

 Adebahr hill section, 10 

 Albany, 9, 30 



Allodesma subellipticum, 103 

 Alplaus creek, 31 

 Altamont, 9, 47 

 Ambonychia radiata, 9 

 Amplexograptus arctus, sec Diplo- 



graptus (Amplexograptus) arctus 

 Amplexograptus macer, see Diplo- 



graptus (Amplexograptus) macer 

 Amsterdam limestone, 15, 16, 22 

 Amsterdam quadrangle. 10 

 Aqueduct, 38, 41 

 Archinacella deleta, 109 



orbiculata, 60, 61, 62, 108-9 



patelliformis, 109 

 Arthroclema pulchellum, 21 

 Arthrostylus tenuis, 51 

 Asaphus platycephalus, 20, 21 

 Atactoporella? crassa, 21 

 Atrypa (Protozyga) exigua, 20 

 Aurivillius, Dr W. S. cited, 122 

 Avicula trentonensis, 97 

 Azygograptus sp., 41, 48 



simplex, 31 



Ballston Spa, 31, 32 

 Bassler, R. S., cited, 71, /2, 13, 50 

 Bather, F. A., cited, 72, 122 

 Bathyurus op., 117, 118 



extans, 118 

 Beecher, C. E., cited, 70, 9, 10, 119, 



120 

 Beekmantown formation, 35 

 Bellerophon, sp., 21 

 Bibliography, 69-73 

 Billings, E., cited, 70, 89. no 

 Black creek, 30, 48, 50 

 Bluestone, 40 



Bozen kill, 41, 47 



Brayman shales, 45, 46, 54-58 ; sum- 

 mary of conclusions, 67 



Callograptus multiramosus, _|4 

 Callopora nealli, 51 

 Calymmene, 51 



callicephala, 20 



senaria, 16, 22, 24, 2s, 60, 62, 120 

 var., 23 

 Camarella cf. volborthi, 20 

 Camarotoechia sp., 35, 45 

 Canajoharie, 23, 28 

 Canajoharie creek, 14, 20 

 Canajoharie section, 2/ 

 Canajoharie shale. 6, 15, 29. 30, 31. 



32, 38, 39, 47, 63, 64. 65, 67, 69; 



first use of term, 28; summary 



of conclusions, 66 

 Carabocrinus, 64, 65 



cf. radiatus, 60, 61, 86 

 Carinaropsis cf. carinata, 63 



orbiculatus, 108 



patelliformis, 109 

 Ceratopsis chambersi, 51, ^2. 121-22 

 Ceraurus pleurexanthemus, 20, 51, S- 

 Cheirocrinus, 51 



Chuctenunda creek, 10, 14, 16, 17, 18 

 Clarke, J. M., cited, 70, 71, ■;-2, 11, 49, 



56. 95. 114. 116, 123 

 Clathrospira subconica, 23, 25, 60, 62 

 Clidophorus sp., 23 



foerstei, 60, 62, 99 



planulatus, 99, 100 



ventricosus. 60, 62. 99-100 

 Climacograptus bicornis, 8, 31, 45. 84 

 mut. ultima, 49 



caudatus, 14. 59, 63. 64. 6s 



mohawkensis, 32, 33, 63 



cf. putillus. 18. 34 

 niut. cximius. So 



145 



