A Somewhat Dated, But Still Useful, Introduction to Trace Fossils, September 20, 2006
I first used this book as an undergraduate geology student thirty years ago. Although much work has been done in ichnology since then, this book still provides a good reference to this subject. Attention is paid to unusual trace fossils no less than common ones. Instead of photographs, drawings and diagrams are provided of trace fossils.
There is an excellent section on the distinction between inorganic and organic trace fossils. Frey warns that burrows and roots may be interpreted as such according to the preconceptions of the investigator (p. 77). Interpretations can be tricky, and some past mistakes have bordered on the embarrassing. It is sobering to realize, for example, that modern bee-nest traces had at one time been mistaken for ancient trace fossils!