A good dictionary doesn't use the term being defined in the definition. This is not a good dictionary. Geology is a visual science. To be a good field reference, pictures would be so very helpful, but there are none. Instead, stratification will be defined as "having strata." This may be a decent memory jogger for someone with a degree in geology, but for the amateur rock-hound, it's a waste of money.

It is the most helpful book I've ever had for this subject- very clear, and concise but highly informative.

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This new edition seems to be both a step forwards and a step backwards, at the same time. The list of terms that are explained is exhaustive. In that sense it is an improvement on the earlier edition. Many geographic terms that are relevant to geology have been included for the first time. However, all the diagrams have been omitted (due to space / price constraints?), and if a picture can paint a thousand words...... Overall though an essential text for any student of geology worth their (rock) salt!!