The third article in this series gives a systematic description of the Radiolaria; this group of protozoans is very rich in species (almost 60001), all restricted to the marine environment, often with a pelagic way of living. Their skeletons (mostly siliceous) are preserved in widely different marine sediments; high percentages are found in certain deep sea sediments (radiolaria ooze). Radiolaria are among the oldest organisms on earth; their value as age indicator is poor. Finds of Radiolaria in the Netherlands are mentioned; a special place have the erratics found in the Netherlands, derived from Paleozoic outcrops in Germany and Sweden.

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Grondboor & Hamer

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Nederlandse Geologische Vereniging

E.Th.N. Spiker. (1967). Microfossielen en hun waarde voor de ouderdomsbepaling van lagen in de Nederlandse ondergrond. 3. Radiolariën. Grondboor & Hamer, 21(1), 1–10.