Stratigraphic section from Darling Downs site QML796 showing horizons with radiocarbon dated bivalve shells

Figure 1 shows a stratigraphic section of an excavation site QML796, with undisturbed stratigraphy that represents ephemeral fluvial channel and overbank deposits in a small, restricted catchment on the Darling Downs, southeastern Queensland, Australia. During excavation, bivalve shells were collected as part of research into the implication for radiocarbon dating in cryptic meteoric diagenesis in freshwater bivalves.

图1展示了发掘遗址QML796的地层剖面，其未受扰动的地层代表了澳大利亚昆士兰州东南部达令唐斯地区一处小型受限汇水区内的暂时性河流河道与河漫滩沉积。发掘过程中，研究人员采集了双壳类贝壳，以开展针对淡水双壳类隐蔽大气成岩作用对放射性碳定年影响的相关研究。