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Query: keyword: "erratics"

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 Article: A new Late Ordovician erratic anthaspidellid sponge (Porifera) originating from Baltica
F. Rhebergen, in: Scripta Geologica, Vol. 146 (2014), p. 1-15
 Article: Short note on three species of Ordovician Orchocladina (Demospongea, Porifera)
F. Rhebergen, in: Scripta Geologica, Vol. 143 (2011), p. 123-126