This article deals with the occurence of a new type of fennoscandinavian rapakivi boulder indicator in the Netherlands. Several different types have been found in the Saalian 'Red Boulder Clay', collected from pits and excavations nearby and along the Hondsrug, in the north of the Netherlands.

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Grondboor & Hamer

CC BY 3.0 NL ("Naamsvermelding")

Nederlandse Geologische Vereniging

H. Huisman. (1979). Tarkki-graniet. Een nieuw type zwerfsteen-rapakivi. Grondboor & Hamer, 33(1), 24–32.