Late Neoproterozoic and Early Cambrian palaeogeography: models and problems Pisarevsky, S. A. ; Murphy, J. B. ; Cawood, P. A. ; Collins, A. S. Abstract Publication: Geological Society of London Special Publications Pub Date: January 2008 DOI: 10.1144/SP294.2 Bibcode: 2008GSLSP.294....9P