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[Burgess shale]  ... Burgess shale, BC, Canada (and other Canadian Rockey) specimens
[Marjum Fm.]     ... Marjum formation, Utah, USA
[Wheeler Fm.]    ... Wheeler formation, Utah, USA
[Weeks Fm.]      ... Weeks formation, Utah, USA
[Other N. American site]  ... Spence shale, Pioche shale, Matewee Fm., Mt. Simmon Ccnvex etc...
[ROW site]       ... Emu Bay shale etc...