Collom, C. J.; Johnston, P. A.; Powell, W. G. (2009). "Reinterpretation of 'Middle' Cambrian stratigraphy of the rifted western Laurentian margin: Burgess Shale Formation and contiguous units (Sauk II Megasequence); Rocky Mountains, Canada". Palaeogeography, Palaeoclimatology, Palaeoecology. 277 (1–2): 63–85. Bibcode:2009PPP...277...63C. doi:10.1016/j.palaeo.2009.02.012.
Powell, W. (2009). "Comparison of Geochemical and Distinctive Mineralogical Features Associated with the Kinzers and Burgess Shale Formations and their Associated Units". Palaeogeography, Palaeoclimatology, Palaeoecology. 277 (1–2): 127–140. Bibcode:2009PPP...277..127P. doi:10.1016/j.palaeo.2009.02.016.
Collom, C. J.; Johnston, P. A.; Powell, W. G. (2009). "Reinterpretation of 'Middle' Cambrian stratigraphy of the rifted western Laurentian margin: Burgess Shale Formation and contiguous units (Sauk II Megasequence); Rocky Mountains, Canada". Palaeogeography, Palaeoclimatology, Palaeoecology. 277 (1–2): 63–85. Bibcode:2009PPP...277...63C. doi:10.1016/j.palaeo.2009.02.012.
Powell, W. (2009). "Comparison of Geochemical and Distinctive Mineralogical Features Associated with the Kinzers and Burgess Shale Formations and their Associated Units". Palaeogeography, Palaeoclimatology, Palaeoecology. 277 (1–2): 127–140. Bibcode:2009PPP...277..127P. doi:10.1016/j.palaeo.2009.02.016.