146 
INDEX. 
Page. 
Schuchert, Charles, cited on brachiopods 
of the Chemung fauna 85 
Sediments, different classes of, limited dis- 
tribution of 113 
Sellersburg formation, equivalents of 123 
fossils of 66-67 
Shales, variability of fossils of 33 
Sherburne formation, geologic horizon of. 112,122 
thickness of 93 
Shifting of faunas, biological consequences 
of 105-108 
effect, of, on classification of forma- 
tions 108-116 
evidence of 97-103 
observations on IS 
principles inv< lived in 103-105 
South America; Devonian faunas of, rela- 
tions of 79 
Species, definition of term 127-130 
life endurance of 30-31 
mutation of 17, 81-82 
Sphenotus contractus, occurrence of. 85, 86, 87, 96 
Spirifer (Cyrtia) altus, occurrence of 88 
Spirifer altus fauna, geologic place of 48 
Spirifer bimesialis, occurrence of 79 
Spirifer disjunctus, occurrence of 61, 
78, S3, 85, 86, 87, 88, 89, 91, 94, 96, 122 
Spirifer disjunctus fauna, epoch of, limits 
of 133 
faunules or stages of 48 
fossils of, lists showing 83, 85, 86, 87, 88, 94 
geologic place of 46, 49, 50 
occurrence of 69,82,83-89, 
91, 92, 93, 94, 95, 96, 97, 99, 100, 116, 133 
Spirifer fimbriatus, occurrence of 70 
Spirifer granulosus, occurrence of 51, 
58, 59, 60, 62, 63, 64, 65, 67, 75, 90, 95 
Spirifer hungerfordi, occurrence of 79 
Spirifer (Retieularia) laevis, occurrence of. . 78 
Spirifera laevis stage or faunule, geologic 
place of 45, 47, 69 
Spirifer marcyi, occurrence of 88, 90, 91 
Spirifer medialis, occurrence of 62 
Spirifer (Delthyris) mesicostalis, occur- 
rence of 61, 70. 72, 83, 85, 88 
Spirifer mesicostalis fauna, geologic place 
of 45,46 
Spirifer mesistrialis, occurrence of 72, 
74, 76, 77, 83, 85, 86, 88, 94, 95, 96 
Spirifer mesistrialis stage or faunule, geo- 
logic place of 47, s^ 
Spirifer orestes, occurrence of 79 
Spirifer (mucronatus) pennatus, occurrence 
of 51,52, 
56, 57, 59, 60, 62, 63, 64, 65, 67, 70, 71, 75, 76 
Spirifer (mucronatus) pennatus fauna, geo- 
logic place of 48 
Spirifer pennatus posterus, occurrence of . . 70, 
71,72,74,77,88,95,96 
Spirifer subattenuatus, occurrence of 79 
Spirifer verneuili, identity of, with S. dis- 
junctus. 
Spirigera concentrica ( = Athyris spirifer- 
oides) occurrence of 65 
Stevenson, .7. J., aid by 49 
Stictopora, occurrence of 67 
Page. 
Stictopora meeki, occurrence of 74 
Streptelasma rectum, occurrence of 64 
Streptorhynchus fauna, geologic place of . . 46 
Strophalosia hystricula. See Productella 
hystricula. 
Stropheodonta arcuata, occurrence of 79 
Stropheodonta calvini, occurrence of 79 
Stropheodonta canace, occurrence of 79 
Stropheodonta cayuta, occurrence of 83 
Stropheodonta demissa, occurrence of 67 
Stropheodonta mucronata, occurrence of .. 74,83 
Stropheodonta (Cayuta) mucronata stage or 
faunule, geologic place of 47, 48 
Stropheodonta perplana, occurrence of 56, 
57, 58, 63, 67 
Stropheodonta variabilis, occurrence of 79 
Strophonella reversa, occurrence of 79 
Succession of faunas, methods of 105-108 
T. 
Teller and Monroe, cited on Hamilton fauna 
of Wisconsin 65 
Tellinopsis subemarginata, occurrence of.. 56 
Time-scale, bionic, tabular presentation of. 132- 
134 
Time-scales, faunal, formational, and geo- 
logical, definitions of 118-120 
Time values in geology, title of paper on . . 27 
Trilobite eon, table showing classification 
and nomenclature of 133 
Tropidoleptus earinatus, occurrence of 51, 
56,59,60,61,62,63,64,67,71, 
72, 75, 76, 82, 89, 90, 91, 95, 96 
Tropidoleptus earinatus fauna, definition of 
term ." 131-132 
distributional values of species compos- 
ing 52 
dominant species of, lists of 58-62 
frequency values of species composing. 52 
geologic place of 43, 47, 48, 50 
mutation and correlation of 81-82 
occurrence of 81, 82, 89-92, 
95, 97, 99, 100, 111, 114-115, 116, 120, 122, 123 
range values of species composing 53-54 
species characteristic of 51, 89-90 
tables of 51, 56, 57, 62-66, 71-72 
tables of, Cayuga Lake section 51-56 
Eighteenmile Creek 57 
Illinois 66 
Michigan .- . 65 
New York (eastern) and Pennsyl- 
vania 63 
Ontario. Canada 64 
Portage formation 70-72 
Unadilla region 62 
Wisconsin 65-66 
Tully limestone, extent of 115 
geologic horizon of 50, 115, 122 
thickness of 93 
Unadilla region, fauna of . 
62 
Van llise, C. R., work in geologic correla- 
tion done by 10 
