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Downes, Hilary and MacDonald, R. and Upton, B.G.J. and Cox, K.G. and Bodinier, J.L. and Mason, P.R.D. and James, D. and Hill, P.G. and Hearn, B.C. (2004) Ultramafic xenoliths from the Bearpaw Mountains, Montana, USA: evidence for multiple metasomatic events in the lithospheric mantle beneath the Wyoming craton. Journal of Petrology 45 (8), pp. 1631-1662. ISSN 0022-3530.