At Olduvai Gorge natural erosion exposed a deep series of superimposed geological beds containing rich artefact and fossil assemblages spanning the last 1.8 million years. The sire ot famous as a rsult of excavations conducted there since 1951 under the direction of Mary Leakey and her husband, the late Louis Leakey. This volume, written largely by Mary Leakey herself, is the last of the reports and records the archaeological finds in the upper part of the Olduvai sequence from excavations carried out from the end of 1968 until 1971. The period covered here is from about 1.2 to 0.4 million years ago and th efinds include artefacts and faunal remains excavated from sites in beds II, IV na the Masek beds. The volume follows on from the archaeological record in beds I and II published in volume 3 of the series.

International archaeologists examine early Stone Age tools and bones to present the most holistic view to date of the archaeology of human origins.

This new volume on the Geology of East Africa provides a concise account of the multi-faceted regional geology and stratigraphy of East Africa, that is Kenya, Tanzania and Uganda. Much of the data presented, however, is highly relevant to the surrounding countries and regions as well. Professionals and students, intending to delve into the details of the geological history of that region will appreciate the present volume as a stepping-stone, paving the way to additional studies of the numerous references given in this work.

Calcretes are an important component of many ancient fluvial, lacustrine and shallow-marine carbonate sequences, and they are widely developed in many parts of the world at the present time. Calcretes are useful to the earth scientist involved in reconstructing ancient environments, palaeoclimates and palaeographics, and they may also reveal details of soil biota and chemistry. Over the last two decades the journal Sedimentology has published a number of articles on this subject and a compilation of them is presented here. In addition to the five main sections, this volume also includes an introduction to the subject that offers a review of recent work on calcretes. The collection of papers illustrates the range of calcrete occurrences and the great variety of textures and fabrics. This volume is authored and edited by experts and will serve as more than an introduction to the subject for geologists, soil scientists and geographers. If you are a member of the International Association of Sedimentologists, for purchasing details, please see: http://www.iasnet.org/publications/details.asp?code=RP2