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Baltisphaeridium placacanthum
General Images Stratigraphy Description Literature Notes
placacanthum
Deflandre, G. and Cookson, I.C. (1955)
Downie, C. and Sarjeant, W.A.S. (1965)
Systematophora placacantha.jpg
other
Hystrichosphaeridium placacanthum
Impletosphaeridium placacanthum
Systematophora placacantha.jpg
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