
INDEX. 
An asterisk attached to a number denotes that a figure of the genus will be found on 
the page indicated. A single reference only its given to each main division of the 
Geological Record in which a genus is mentioned. 
Aachenian, 825 
Aar glacier, 418 
Abysmal deposits, £39, 469; no trace of, 
in earth’s crust, 911 
Abyssinia, basaltic plateau of, 258 
Acacia, 862 
Acadian rocks, 660 
Acanthoceras (Ammonites), 808 * 
Acanthocladia, 753 
Acanthodes, 709*, 710, 741, 757 
Acanthopholis, 809 
_ Accessory minerals, 61 
Acer, 803, 839, 859, 862, 871 (see Maple) 
Acerotherium, 877 
Acervularia, 664, 677*, 696 
- Acicularia, 848 
Acid, treatment of rocks with, 191 
Acid rocks, 58, 130 
Acidaspis, 664, 665 * 
Acotherulum, 856 
' Acroculia, 665, 700 
Acrodus, 763, 775 
Acrosalenia, 773 
_Acrostichites, 761 
- Acrotreta, 665 
Actxonina, 793 
Actinacis, 804 
Actinoceras, 676 
Actinocrinus, 664 
Actinodon, 754 
Actinolite-schist, 121 
Actinophyllum, 682 
Adapis, 856 
Adelsberg, caverns of, 399 
Adige River, alluvium of the, 382, 390 
Adour River, change of mouth of, 323 
Adriatic, filling up of, 390 
Aichmodus, 775 
Aiglina, 665*, 667 
Aigoceras (Ammonites), 786, 787*, 788 * 
Alurogale, 856 
AXolian deposits, 155, 322, 324 
j Aerolites, 7 
- Aatites, 175 
Aitobates, 840 
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Africa, average height of, 36; coast line, 
41; daily range of temperature in equa- 
torial, ‘319; sand erosion in, 320; deserts 
of, 325; dust cloud from, 326; sand 
rivers of, 369 
Agathaumas, 832 
Age as a basis of rock-classification, 109, 
146, 149 
Agglomerated structure, 87, 163 
Aggregation, state of, in rocks, 91 
Aglaspis, 660 
Agnostus, 649*, 651, 664 
Ahrien, 702 
Air, see Atmosphere 
Aix-la- Chapelle, mineral waters of, 351; 


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ee relative bulk of, 36; 
Cretaceous flora of, 626, 803, 828 
Alaska, yoleanic island, 250 
Albertia, 761 
Albian, 825, 828 
Albite, 72 
Alder, early forms of, 860, 871 
Alethopteris, 726, 727*, 756, 772, 786, 817 
Algee, action of calcareous, 456, 462 
Algiers, artesian wells of, 346 
Alkaline Carbonates, action of, 302, 348, 
454 
Alkaline deposits on soil, 327; in lakes, 
395 
Allen, Bog of, 460 
Allorisma, 753 
Alluvial division of Post-Tertiary series, 
883 
| Alluvium, at foot of mountain slopes, 380 ; 
on river-beds, 381; on river-banks and 
flood-plains, 382; in lakes, 385, 393; 
in maritime bars and lagoons, 385; at 
river mouths in the sea, me 
Almonds, early forms of, 8 
Alnus, 803, 859 
ae type of mountain structure, 916, 
grouping of, 
38; horizontal compression of plicated 
rocks in, 314,519; earth pillars of, 341; 
snow-line in, 403; glaciers of, 404, 406, 
