van Loon, A.J. (Tom)2014-07-042014-07-042014-06-30Geologos, 2014, 20, 2, s. 139-146978-83-232187-4-61426-8981http://hdl.handle.net/10593/11041A 1-million m3 breccia near Laiyuan (Hebei Province, E China) occurs as a block-like lithological unit between dolo -stones of the 1.55–1.45 Ga (Early Mesoproterozoic) Wumishan Formation. It has previously been interpreted as a seis -mite, but it appears not to fulfil any of the commonly accepted criteria that jointly are considered diagnostic for seis -mites. Its presence in a graben-like structure with almost vertical bounding fault planes rather indicates an origin as a (submarine) valley fill. As the valley originated by tectonic activity in the form of faulting, the breccia can be consid-ered as a secondary effect of seismic activity, but it does not represent a seismite.enSeismiteValley fillGraben sedimentationWumishan FormationMesoproterozoicFangshan geoparkHebei ProvinceChinaArtykuł