Stachyspongia en Ragadina
Grondboor & Hamer , Volume 21 - Issue 5 p. 164- 170
A find from the Early-Pleistocene sand from Sibculo is discussed. It concerns the Stachyspongia tuberculosa (Roemer), a silicifed sponge of a species which has not previously been found in our country and probably had its origin in the Upper Cretaceous of the Hanover-area.
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