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地质学报 1925
ONTHEAGEOFTHETAIYUANSERIESOFNORTHCHINA.Keywords: 毛石,承山,切面,幼子,石灰岩,太原,博山,无礼,山丹,无云 Abstract: RegardingtheageofthemarinebedsinthelowerpartofthecoalbearingseriesofNorthChina,palaeontologistsdifferwidelyinopinion.IthasbeenassignedtovarioushorizonsrangingfromViseenuptoUpperCarboniferousbyformerinvestigators,suchasGirty,Loczy,Frech,
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