The West Church is one of the largest churches of Umm el-Jimal archaeological site which comprises 16 churches. The date of the construction of the church is debated and the dates of its latest stages of renovation and use are obscure. This research aims to investigate the chronology of the church and clarify the dates of the latest renovation of its mosaic and plaster floors. The radiocarbon dates are carried out on organic inclusions of mortars and plasters from the floors of the church collected from three trenches opened in different locations of the church. The radiocarbon dates showed that the mosaic floors of the nave and the raised chancel, built with the same technology, were paved contemporaneously between 433 and 565 cal AD, while the plaster floor of the courtyard at the east entrance of the north room of the church was paved before the 551 cal AD (433 and 539 cal AD). The results include an old date (16–203 cal AD), which might represent an older phase of the church’s history or more probably an earlier structure. The date of the mosaic, which more probably indicates its construction rather than a renovation phase, agrees with the dates of the pottery sherds (although few and small) uncovered from the excavated trenches. The date of the mosaic floor that lies before 565 cal AD contradicts the general trend of the dates for the renovation of other churches, after 551 AD, the date of the disastrous earthquake that affected the Umm el-Jimal site.

西教堂是乌姆吉马尔考古遗址最大的教堂之一，由 16 座教堂组成。教堂的建造日期存在争议，其最新阶段的翻修和使用日期也不清楚。这项研究旨在调查教堂的年代，并澄清其马赛克和石膏地板最新翻新的日期。放射性碳测年是对教堂地板上的灰浆和灰泥的有机包裹体进行的，这些灰泥和灰泥是从教堂不同位置开的三个战壕收集的。放射性碳测年显示，中殿和高架圣坛的马赛克地板是在公元 433 年至 565 年间同时铺设的，采用相同的技术，而教堂北房间东入口庭院的石膏地板是在公元 433 年至 565 年间同时铺设的。于公元 551 年（公元 433 年和 539 年）之前铺设。结果包括一个古老的日期（公元 16-203 年），它可能代表了教堂历史的更古老阶段或更早的结构。马赛克的日期更可能表明其建造阶段而不是翻新阶段，与从挖掘的战壕中发现的陶片（尽管数量很少且很小）的日期一致。马赛克地板的日期位于公元 565 年之前，与其他教堂翻修日期的总体趋势相矛盾，即公元 551 年之后，即影响乌姆吉马尔遗址的灾难性地震的日期。