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Life on Earth can be traced back over three thousand million years into the past. Many examples of the Earth's past inhabitants are to be found in rocks, preserved as beautiful and fascinating fossils. The earliest life forms were bacteria and algae; these produced the oxygen that enabled more complex life forms to develop. About 600 million years ago multi-cellular organisms appeared on Earth, some of which could protect themselves with hard parts such as shells. Many of these life forms were readily fossilized and are used to subdivide geological time. Numerous species have evolved and most are now extinct. Lineages can be traced and extinctions explained as a consequence of terrestrial and extra-terrestrial events. Lavishly illustrated with photographs and explanatory diagrams Introducing Palaeontology provides a concise and accessible introduction to the science of palaeontology. The book is divided into two parts. The first explains what a fossil is; how fossils came to be preserved; how they are classified; and what information they can tell scientists about the rocks in which they are found. The second part introduces the major fossil groups taking a systematic view from algae and plants, through the numerous examples of invertebrate animals, to the vertebrates and finally to man's ancestors. Technical terms are kept to a minimum and a glossary is provided.
Life on Earth can be traced back over three thousand million years into the past. Many examples of the Earth's past inhabitants are to be found in rocks, preserved as beautiful and fascinating fossils. The earliest life forms were bacteria and algae; these produced the oxygen that enabled more complex life forms to develop. About 600 million years ago multi-cellular organisms appeared on Earth, some of which could protect themselves with hard parts such as shells. Many of these life forms were readily fossilized and are used to subdivide geological time. Numerous species have evolved and most are now extinct. Lineages can be traced and extinctions explained as a consequence of terrestrial and extra-terrestrial events. Lavishly illustrated with photographs and explanatory diagrams Introducing Palaeontology provides a concise and accessible introduction to the science of palaeontology. The book is divided into two parts. The first explains what a fossil is; how fossils came to be preserved; how they are classified; and what information they can tell scientists about the rocks in which they are found. The second part introduces the major fossil groups taking a systematic view from algae and plants, through the numerous examples of invertebrate animals, to the vertebrates and finally to man's ancestors. Technical terms are kept to a minimum and a glossary is provided.
Our world is made of rock. Although much of the Earth's surface is covered by vegetation, concrete or water, if one digs down far enough solid rock will always be found. Those who live in a landscape where rock outcrops are obvious will have wondered about the kind of rocks they are looking at and how they came to be where they are now. This introductory book explains in simple terms what geology can tell us about the world. Many objects of great beauty and which excite our curiosity, such as crystals or fossils, are to be found by examining rocks. Those searching for and examining such objects gain much more by knowing how and when they originated. In particular fossils, whilst interesting in themselves, tell us from their context in geological time of biological evolution and these clues give an insight into the origins of life on earth. Copiously illustrated this book is intended for those whose interest in geology has been awakened, perhaps by media coverage of earthquakes or dinosaurs and want to know more. Technical terms are kept to a minimum and are explained in a glossary.
Cette bibliographie commentee touche tous les domaines du savoir humain, soit de l'Art a la Zoologie;elle signale les ouvrages les plus importants soit des bibliographies, des index, des encyclopedies, des dictionnaires, des guides, des revues etc dont le support ed'information est soit du papier, soit un cd-rom, soit une base de donnees en ligne directe, soit un microforme ect. L'objectif du guide Walford est de devenir La source d'information sur tout type de reference, nonobstant le support technique.

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