in neighbouring re- gions may throw light on man’s evolutionary pedigree. GEOLOGICAL EVIDENCE OF FORMER LIFE FISHES MID-PALAEOZOIC 18,000,000 TIME UNITS PALAEOZOIC INVERTE- EARLY PALAEOZOIC ‘ROCKS CHIEFLY UNMETAMORPHOSED: SEDIMENTARY PREDOMINANT; 30 MILLIONS 2 O e . ms : gs wx] ANIMIKIAN 25 ag w EVOLUTION = oF I [HURONIAN INVERTE- BRATES ALGOMIAN SUDBURIAN eee a | U |i m il idi xvii Wiltshire. Wisconsin. War Offce. W orcestershire. Women’s Royal Naval College, Greenwich. Author ea Owen: of Sea, Land and Water Illus- trated. Author of War (1926), and among the states. Since each crystallised mineral gives a cloud of gas measure about 22 times as small as the most efficient technical and advisory commission on the