142 
INDEX. 
Page. 
Chron, definition of term "... 31, 132 
Chronologic terms, bionic, proposal of 31 
Cladochonus fauna, geologic place of 45 
Clarke, J. M., aid by 49 
cited on Chemung and Ithaca forma- 
tions, limits of 93 
cited on fauna of High Point, Naples, 
N. Y 78,79 
cited on faunas of Livonia salt shaft ... 63 
cited on faunas of Portage formation at 
different points 103 
cited on fossils from Juliand Hill, Che- 
nango County, New York 94 
cited on mingling of species of adjacent 
faunas 103 
cited on Oneonta and Portage sand- 
stones, stratigraphic equivalency of. . 100 
work done by 8 
Clark, W. B., aid by 67 
work in geologic correlation done by . . 10 
Cleland, H. F., aid by 9, 49, 5 1 55 
cited on Hamilton fauna of Cayuga 
Lake 80 
Cleveland shale, stratigraphic place of 47 
Coleolus acicula, occurrence of 77, 90 
Coleolus tenuicinctum, occurrence of 95 
Cornell University, work done at . . . 6, 7, 8, 9, 43, 46 
Correlation, geologic, diverse data employed 
for 117-120 
importance of 10 
work done in 10 
Correlation and mutation of faunas, dis- 
cussion of 81-82 
Cryphaeus boothi, occurrence of 56,57,58,64 
Cryptonella fauna, geologic place of 45 
Cryptonella eudora, occurrence of 77,78 
Cuboides fauna, occurrence of 69 
results of studies of 79 
Cuyahoga -hale and sandstone, faunule of. 48 
Cypricardella bellistriata. occurrence of ... 74, 
77, 82, 90, 91, 95 
Cypricardella complanata, occurrence of . . 95 
Cypricardella gregaria, occurrence of. 76, 77. 95, 96 
Cyrtia. See Spirifer altus. 
Cyrtina hamiltonensis, occurrence of .. . 74,91,95 
Cystiphyllum, occurrence of 67 
Dall, W. H., and Harris, G. I)., work in 
geologic correlation done by 10 
Dalmanella infera, occurrence of 79 
Dalmanella leonensis, occurrence of 86 
Darton, N. H., aid by 8,49 
Dana, J. D., cited 43 
Darwin, Charles, cited 33, 41 
Delaware limestone, stratigraphic equiva- 
lents of 122 
Delthyris mesicostalis, occurrence of 61, 
70, 72, 83, 85, 86, 88, 91, 94, 95, 96 
See alto Spirifer mesicostalis. 
Devonian formations, dissection and analy- 
sis of faunas of 42-96 
Devonian formations of Ohio and New 
York, correlation of 120-123 
Devonian limestone, intermediate faunas 
of 7 
Page. 
Devonian system, faunal classification of, 
introduction of 45-48 
Dewalque, G., cited 28 
Diaphorostoma lineatum, occurrence of 64 
Discina fauna, geologic place of 45 
Disjunctus fauna. See Spirifer disjunctus. 
Distribution, geographic, of faunas, obser- 
vations on 16-20 
I »ual nomenclature in geology, suggestions 
concerning 11-13 
title of paper on 12 
Ectenodesma birostratum, occurrence of . . 96 
Edmondia philipi, occurrence of 96 
Eighreenmile Creek section, fauna of 57-58 
Encrinal beds, geologic place of 50 
Environment, changes in, changesin species 
coincident with 33-34 
Eon, definition of 31, 133 
Epoch, definition of 31, 132 
Equivalency of geologic formation, deter- 
mination of, diverse data used for . 117-120 
Era, definition of 31.133 
Erie shale, correlation of 112, 120, 122 
Europe. Devonian faunas of, relations of. . . 79 
Fauna, definition of 16, 29-30, 131-132 
Faunal aggregates, observations on 28-32 
Faunal time-scale, definition of 118 
Faunas, association of, with favorable en- 
vironment 113 
biologic equilibrium of, conditions fa- 
voring : 105-108 
classification of 48-49 
correlation of 81-82 
differences in, causes of 35 
dissection of, for New York province .. 42-96 
distribution of 16-20, 113 
facies of 35 
integrity of, conditions favoring 105-108 
local expressions of 25 
migration of 18, 23-24, 31-32, 34-41 , 97-1 If. 
migration of, geological expression of. . 33-41 
mingling of 31, 103 
mutation of 81-82 
nomenclature of 20-27 
recurrences of 113 
shifting of 18,23-24,31-32,34-41,97-116 
shifting of, biological consequencesof. 105-108 
effect of, on classification of geolog- 
ical formations 108-116 
evidence of 97-103 
principles involved in 103-105 
succession of, principles involved in. 105-108 
value of, as time indicators in geology. 101-103 
Faunule, definition of term. 6(note), 24, 47, 131-132 
Faunules, succession of, importance of 25 
Fistulipora occidens, occurrence of 79 
Flora, definition of 16 
Formational time-scale, definition of — 118, 119 
Formations, geologic, classification of; as 
affected by shifting of faunas 108 
correlation of, methods used for 117-120 
nomenclature of 27-28 
time relations of, basis for determining. :1s 
