The above article discusses a count of erratic boulders from the top of light greyish boulder clay by means of Hesemann's four-groups method for crystalline rocks (fig.2). Further the results are given of analyses of small erratics, sized from 3 to 5mm, from a boring in the same locality. A brief description is given of the four known associations of small erratics in grey, red and greyish black boulder clay (table I). The location is in the southwestern part of the province of Friesland.

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J.G. Zandstra. (1967). Een zwerfsteentelling bij Wyldemerk (Gaasterland) (en gegevens over keileem en het fijnere morainegruis). Grondboor & Hamer, 21(1), 12–19.