Framboidal pyrites are denselypacked, raspberrylike, spherical aggregates of equigranular, micronsized crystals or microcrysts. Because of the difference principle in framboidal pyrites formation between oxic and euxinic depositional conditions, size distribution of framboids is indicative of oxygen levels for palaeo-ocean water column. However, only oxic and euxinic conditions can be definitely distinguished but suboxic or ferruginous conditions (anoxic and containing dissolved Fe²⁺) using the framboidal pyrites, and framboids formed in ferruginous condition may indicate euxinic environment. Therefore, incompatible results for deepwater redox conditions of the terminal Ediacaran Nanhua Basin have been achieved using framboidal pyrites size statistics and other available methods, respectively. We consider that the euxinic deepwater condition implied by framboids was incorrect, and the small pyrites may be formed due to limited sulfate concentrations in the basin and accordingly little H₂S supply. In order to get credible results, other proxies, such as iron species, redox sensitive trace elements and stable isotope methods should be applied simultaneously when using framboidal pyrites to reconstruct palaeoocean environments.