Life Pulse Episodes from the Story of the Fossil Record

PENGUIN BOOKS

Published by the Penguin Group 27 Wrights Lane, London W8 5TZ, England Viking Penguin Inc., 40 West 23rd Street, New York, New York, 10010, USA Penguin Books Australia Ltd, Ringwood, Victoria, Australia Penguin Books Canada Ltd, 2801 John Street, Markham, Ontario, Canada, L3R 1B4 Penguin Books (NZ) Ltd, 182-190 Wairau Road, Auckland 10, New Zealand

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First published in Great Britain by Facts on File Ltd 1987 Published in Pelican Books 1989 10 9 8 7 6 5 4 3 2 1

Copyright © Niles Eldredge, 1987 All rights reserved

Printed and bound in Great Britain by Richard Clay Ltd, Bungay, Suffolk

Except in the United States of America, this book is sold subject to the condition that it shall not, by way of trade or otherwise, be lent, re-sold, hired out, or otherwise circulated without the publisher's prior consent in any form of binding or cover other than that in which it is published and without a similar condition including this condition being imposed on the subsequent purchaser