458 New York State Museum 



Angel's wings, 142, 155, 167 

 Angiosperms, 436 

 Angle of dip, 50 

 Angola shale, 401 

 Angular unconformity, 58 

 Animal associations, 85 



along the shore, 115 

 Animal tracks, 40 

 Animals, conflict between themselves, 108 



geographical range, 85 

 Anorthosites, 208 

 Anticline, 51 

 Anticlinorium, 53 

 Appalachia, 217 

 Archeozoic era, 196 



climate, 203 



life, 202 

 Argillaceous (clayey) conglomerates, 32 

 Ark, ponderous, 157 

 Ark shells, 157 

 Arkose, 35 



Arkose conglomerates, 32 

 Armadillo slug, 127 

 Arnold, A. F., cited, 182, 443 

 Ascidians, 163, 172, 175 

 Ashokan shales and flags, 395 

 Associations, 85 

 Astarte, chestnut, 158 

 Asymmetrical anticline, 52 

 Atlantic province, 227 

 Atlantic wing shells, 158 

 Atwater creek shales, 289 

 Avicularia, 112 



Bald mountain limestone, 272 

 Balmville limestone, 244 



Barnacle, acorn, 91, 93, 95, 103, 129, 131, 133, 134, 136, 140, 163, 

 172 

 goose, 174 

 rock. 129 



