INDEX 
(PRINCIPALLY TO GEOLOGIC FORMATIONS) 
[For list of families and higher groups, see table of contents (pp. ix-xi) ; for annotated list 
of genera and species, see pp. 138-186. Principal references are given in boldface type.] 
A 
Amsterdam formation, 29, 30, 32, 33 
Anomalorthis zone, 127, 129, 130 
Antelope Valley, Nevada, 126 
Appalachians, 10, 36 
Arbuckle Mountains, 11, 118 
Arkansas (northern), 117 
Arline formation, 32, 39, 41, 42, 43, 46, 50, 
53, 60, 61, 64, 71, 72, 73, 74, 75, 82, 86, 96, 
124, 128 
Ashby stage, 8 
Athens formation, 33, 39, 41, 43, 44, 49, 56, 
64, 82, 93, 123, 124 
Attalla (conglomerate) formation, 38, 45, 
55, 76 
Auburn chert, 113, 117 
Austin Glen member of Normanskill forma- 
tion, 34 
Aylmer formation, 17, 18, 19 
B 
Bacon Bend member, 45 
Barnhart formation, 112, 116, 117, 118 
Barrel Spring formation, 129 
Bassler, R. S., 2, 5 
Bays formation, 38, 45, 907 
Beckett formation, 114 
Beekmantown formation, 7, 88 
Beldens formation, 31, 32 
Bell, W. A., 5 
Bell, W. C., 4 
Bellefonte dolomite, 51 
Beloit dolomite formation, 113 
Benbolt formation, 8, 30, 45, 53, 56, 58, 59, 
63, 66, 68, 69, 71, 73, 76, 82, 83, 86, 87, 90, 
96, 123, 128 
Ben Hur formation, 48, 66, 81 
Benner limestone, 48, 66, 91 
Blackford formation (facies), 38, 40, 45, 48, 
49, 55, 56, 57, 62, 64, 72, 76, 85, 100 
Black Hills, South Dakota, 11, 125 
Black River formation (or group), 1, 7, 8, 
9, 22, 27, 52, 55, 70, 92, 107, 125 
Black River Valley, New York, 22 
Black Rock formation, 15 
Blockhouse (shale) formation, 33, 49, 93 
Bloomsdale formation, 114 
Bolarian, 7 
Botetourt formation, 42, 43, 49, 53, 59, 60, 
61, 62, 64, 73, 74, 98, 124 
Bowen formation, 50, 98 
Bridge, J., 2 
Bromide formation, 107, 118, 120, 128 
Buffalo River series, 113 
Burchards formation, 32 
Burden conglomerate, 34 
Bureau, R., 15 
Burkes Garden member of Benholt forma- 
tion, 46, 50 
Butts, C., 2, 5 
Cc 
California, formations in, 129 
Camarocladia zone (beds), 59 
Camp Nelson formation, 105, 106 
Cane Creek formation, 51, 56, 65, 103, 106 
Carlim limestone, 51 
Carman quartzite, 31, 32 
Carters formation, 51, 55, 78, 92, 102, 103, 
104, 105, 106, 107, III, 112, 116 
Central Basin, Tennessee, 11, 99, 100 
Centre Hall member of Nealmont formation, 
52, 71, 79 
Chambersburg formation, 15, 34, 52, 53, 
79, 81 
Champlain Valley, 10, 27, 31, 32 
Chatham Hill formation, 46, 53, 97 
Chaumont formation, 7, 16, 19, 20, 22, 24, 
26, 27, 30, 32, 33, I10 
Chazyan, I, 7, 18, 92, 108, 123 
Chazy group, 8, 14, 15, 17, 23, 27, 28, 31, 36, 
68, 7I, 103, 125 
Chickamauga limestone, 18, 43, 45, 49, 53, 
54, 55, 56, 83, 100 
Chota formation, 56 
Cliffield formation, 48, 56 
Cliffield group, 56 
Cloche Island formation, 26, 27 
Cloud, PK... Jr..:5 
Clover member of Loysburg formation, 56, 
62, 65, 76 
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