INDEX 305 
Abergavenny, 18 
Acetic acid, 4 
Africa, North, 64, 65 
Alberta, 9 
Algae, 4, I1, 20 
Algal Series, 30, 51, 275, 277 
America, North, 4, 5, 9, 43-45, 52-57, 59, 
60-65, 77, 97, 106-107, 150, 208, 217, 277 
Anchoralis Subzone, 57, 59, 64-65 
Anchoralis-bilineatus interval, 64 
Angulodus, 66 
demissus, 68 
gravis, 69 
sp. nov. B, 66 
sp. nov. C, 68, 69 
sp. nov. D, 68, 69 
walrathi, 66 
Anstruther, 30, 270 
Anthraconaia modiolaris Zone, 7 
A patognathus, 6, 35, 42, 48, 62, 69-77, 90 
bladus, 35, 44, 69, 70, 71 
chauliodus, 71 
geminus, 35, 42, 44, 71, 72 
geminus—Cavusgnathus Assemblage Zone, 
10, 44, 61, 62 
petilus, 42, 72, 73 
porcatus, 73, 74 
scalenus, 35, 42, 74 
cf. libvatus, 43, 75, 76 
SP., 77 
sp. nov. A, 76, 77 
vavians, 40, 69, 75 
Arenigian, 5 
Arnsbergian, 18 
Argyll, 30, 244 
Arkansas, 10 
Arkansas Novaculite, 9 
Askeaton, Eire, 61 
Askrigg Block, 26 
Assemblage Zones 
Britain, 35-51 
Germany, 52-63 
U.S.A., 52-63 
Auchenmade, 30 
Australia, 11, 32, 53, 58, 60, 65, 178 
Austria, 8 
Avesnois, 9 
Avon Gorge, 5, 6, 13, 17-18, 21, 32, 35-36, 
39-41, 44, 46-48, 51, 53, 55-58, 60-62, 
65-66, 78, 98, 106, 176, 193, 200, 202, 
204, 205, 217, 244-56, 277 
Avonia bassus, 17 
Avonian, 13-15, 17-18, 55, 57, 61, 65, 158, 
203, 200-207, 216, 228 
Avonian sections, 13, 17-18, 24, 55 
Avonian Zones, 59 
conodont, 35 
coral-brachiopod, 13-17 
Ayrshire, 29, 30, 51, 244, 272-274, 277 
Ayrshire Coalfield, 29 
Aymestry Limestone, 6 
Bactrognathus, 35, 60, 64—65 
communis, 106 
Bactrognathus—Polygnathus communis 
Assemblage Zone, 56, 60 
Bactrognathus—T aphrognathus Assemblage 
Zone, 10, 56, 61 
Barness East, 30, 50, 266 
Barnett Formation, 10 
Belgium, 9, 17, 36, 39-41, 52-54, 62-65 
Berwick Formation, 60 
Bilston Burn, 30, 269 
Birdshill Limestone, 5 
Bishopsteignton, 6 
Bivalves, 13, 20 
Black Lias Quarry, 23 
Black Rock Limestone, 6, 17, 247 
Black Rock Quarry, 21, 25 
Brachiopods, I1, 13, 20, 27 
Broadstone Limestone, 30, 51 
Bollandian, 18 
Bonaparte Gulf, 57-58 
Boulonnais, 9 
Breconshire, 66, 244 
Bristol, 19, 22, 66, 228 
Bryn Pig Limestone, 5 
Bryozoa Bed, 20 
Burlington Formation, 42, 57, 61, 64, 97, 277 
Burrington Combe, 15 
Bushberg—Hannibal, 9, 236 
Bushberg Sandstone, 9, 56 
Bg Zone, 18 
Callington, 6 
Calciferous Sandstone Measures, 4, 29, 30, 50 
Calciferous Sandstone “ Series’’, 13, 18, 29, 
270, 272 
Caney Formation, 9 
Caninia Oolite, 15, 18, 20, 22, 32, 61 
Caninia Shales, 20 
Caninia Zone, 15, 18, 20, 249, 250 
Caradocian, 5 
Carboniferous, Lower, 7-9, II, 13, 19, 53, 243 
Carboniferous Limestone Series, 23, 29, 30 
