1. The Cambrian and Ordovician Systems;Allen,1968
2. Planolites and Skolithos from the Upper Precambrian-Lower Cambrian White-Inyo Mountains, California;Alpert;J. Paleontol.,1975
3. Trace fossils and the basal Cambrian boundary;Alpert,1977
4. Tidal shelf sedimentation, an example from the Scottish Dalradian;Anderton;Sedimentology,1976
5. Trace fossils from the late Precambrian and lower Cambrian of Finmark, Norway;Banks,1970