Kochman, A. 2026. Geochemical signatures of chert concretions and bedded cherts from the Kraków-Częstochowa Upland (Poland), the southeastern Franconian Alb, and the Bayerwald (Germany). Acta Geologica Polonica. 76, 2 (Jun. 2026), e75. DOI:https://doi.org/10.24425/agp.2026.158189.