A chewed piece of birch pitch from southern Denmark. (a) Photograph of the Syltholm birch pitch and its find location at the site of Syltholm on the island of Lolland, Denmark (map created using data from Astrup78). (b) Calibrated date for the Syltholm birch pitch (5,858–5,661 cal. BP; 5,007 ± 7). (c) GC-MS chromatogram of the Syltholm pitch showing the presence of a series of dicarboxylic acids (Cxx diacid) and saturated fatty acids (Cxx:0) and methyl 16-Hydroxyhexadecanoate (C16OH) together with the triterpenes betulin and lupeol, which are characteristic of birch pitch3.