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Impletosphaeridium placacanthum
General Images Stratigraphy Description Literature Notes
placacanthum
Deflandre, G. and Cookson, I.C. (1955)
Davey, R.J., Downie, C., Sarjeant, W.A.S. and Williams, G.L. (1969)
active
Baltisphaeridium placacanthum
Systematophora placacantha
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