Burrowing below the basal Cambrian GSSP, Fortune Head, Newfoundland Gehling, James G. ; Jensen, Sören ; Droser, Mary L. ; Myrow, Paul M. ; Narbonne, Guy M. Abstract Publication: Geological Magazine Pub Date: March 2001 DOI: 10.1017/S001675680100509X Bibcode: 2001GeoM..138..213G