Interpreting ground-penetrating radar By Lawrence B. Conyers Walnut Creek, CA: Left Coast Press, 2012 ISBN 978-1161132-216-3. Pp. 220. AUD 126. Available from Footprint Books, Warriewood, NSW. Although archaeological remote sensing has achieved reasonable acceptance in Europe and America, Australian terrestrial archaeologists still tend to view the various techniques with a fair degree of confusion and/or suspicion. This ranges from scepticism about its potential to provide any useful results (or, indeed, wariness that it will lose their work), through to enthusiastic advocacy but sometimes overly high expectations, thanks in part to how it is portrayed in the media. A large part of the difficulty in correcting perceptions has been the nature of the available literature on the subject. Most general archaeological texts understandably present only limited description and positive examples as a means of illustrating the potential of the different remote sensing techniques. Conversely, almost all of the detailed handbooks on the market have emphasised the technical aspects of their operation, heavy with the types of language that only a geophysicist could understand or love. Archaeological geophysics in Australia has also been very end-user driven, with university departments purchasing equipment as a device to demystify the techniques and encourage their use, while at the same time having limited in-depth knowledge or the opportunity for consistent use (although there are a few exceptions of postgraduates with a genuine geophysics background). With increasing simplification of the equipment and software, this sort of non-specialist operation is likely to increase worldwide. For many of us in the remote sensing end-user category, this latest volume by Larry Conyers is what we have been waiting for. Conyers is one of the notable personalities in the use of ground-penetrating radar (GPR) and has previously been an author of several more technical tomes on the technique. In this new publication we have a different approach, with Conyers presenting what is in some respects a personal narrative of his worldwide experiences on a vast array of archaeological sites of all periods. Conyers and his students have also spent a couple of decades experimenting, simulating in test sites, comparing the GPR results to the excavated site and learning from their mistakes. The strength of the volume is that he has structured it around presenting numerous examples of what different sites in different environments look like as a GPR reflection along individual transects (the equivalent of looking at a vertical section through a site) or as an amplitude slice (where the transects are compiled to produce horizontal maps of the site depending on depth). Perhaps more importantly, Conyers deals with success and failures and illustrates problems and errors, allowing the novice to decode and understand where he or she went wrong. The opening chapters provide an overview of the basic method and theory of GPR, sufficient that a neophyte could understand the processes of collecting and interpreting the data. This is followed by a personal history of Conyers' use of the technique, which also neatly provides a summary of how the use of the technique has evolved in (primarily American) archaeology. Chapters 3 and 4 deal with geological and cultural complexities, respectively--in essence, how to determine whether the GPR results are being produced or influenced by natural or cultural phenomena. The former might include what happens when you run the equipment over a sand dune, a buried fiver channel, a beach or a body of water. An interesting section on understanding the appearance of bedrock in GPR results as a factor in how we structure conventional archaeological excavations uses Lynley Wallis' work in Gledswood rock shelter in Queensland as an example. The chapter on cultural complexity considers how to distinguish subsurface archaeological features from more recent disturbances, such as pipes and service trenches, compaction from vehicles, or scarring from ploughing and earthmoving. …