The Ireviken Event was the first Middle Paleozoic event consisting of synchronised faunal, isotopic and facies change to be recognised. An analysis of the conodont faunas throughout the Boree Creek/Borenore Limestone succession in the central western region of the Tasman fold belt of New South Wales (Australia) revealing all five conodont zones that comprise the event is presented. While some zonal boundaries are precise, allowing direct comparison of stratigraphic intervals on other paleo-continents, some can only be approximated. Conodont data from pre-Ireviken Event strata, in contrast, only permit the identification of a broad Telychian chronology. The identification of Wenlock post-Ireviken Event conodont zones is incomplete due to lithological variability, namely the presence of tuffaceous beds near the top of the formation and an unconformity between the Boree Creek and overlying Borenore Limestone. The Boree Creek Formation contains the only example of the Ireviken Event discovered to date from the Tasman fold belt of eastern Gondwanaland.

Ireviken 事件是第一个被识别的中古生代事件，包括同步的动物群、同位素和相变化。对新南威尔士州（澳大利亚）塔斯曼褶皱带中西部地区 Boree Creek/Borenore 石灰岩系列的牙形石动物群进行了分析，揭示了构成该事件的所有五个牙形石带。虽然有些带状边界是精确的，可以直接比较其他古大陆的地层间隔，但有些只能近似。相比之下，来自前 Ireviken 事件地层的牙形石数据只允许识别广泛的 Telychian 年代学。由于岩性变异，文洛克后 Ireviken 事件牙形石带的识别不完整，即地层顶部附近存在凝灰质层，以及 Boree Creek 和上覆 Borenore 石灰岩之间的不整合面。Boree Creek 组是迄今为止在冈瓦纳兰东部塔斯曼褶皱带发现的唯一的 Ireviken 事件实例。