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One of the siliceous raw-materials used in the manufacture of artefacts and found in archaeological sites in Central-Eastern Europe is the “Jurassic flint from around Kraków” type, the origin of which is believed to be outcrops of Upper Jurassic sediments scattered throughout the southern part of the Kraków-Częstochowa Upland (Southern Poland). Unfortunately, the identification criteria of this siliceous rock remain unclear, which precludes it being distinguished as a separate variety of siliceous raw-material used in the manufacture of prehistoric artefacts. The early-diagenetic siliceous rocks from the Kraków region include chert concretions and bedded cherts which are hosted in particular limestone facies. The comparative analysis of chert concretions and bedded cherts from the southern and the northern parts of the Kraków-Częstochowa Upland clearly demonstrate that the determination of their provenance based upon macroscopic features, microfacial development and/or the results of geochemical analyses is unjustified. The criteria used in the typological classifications of siliceous artefacts from archaeological sites in Central-Eastern Europe are frequently subjective, ambiguous and unrelated to the geological fundamentals. This precludes the association of any variety of raw-material used in the manufacture of artefacts with a particular source locality. Consequently, any speculation concerning prehistoric human migrations that is based upon the raw-material of siliceous artefacts varieties distinguished in such typological classifications are groundless.
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