Iridium anomaly in the cretaceous-paleogene boundary at Højerup (Stevns Klint, Denmark) and Woodside Creek (New Zealand): The question of an enormous proportion of extraterrestrial component

A significant iridium anomaly, indicative of extraterrestrial material, has been identified at the Cretaceous-Paleogene boundary layers in Højerup (Stevns Klint, Denmark) and Woodside Creek (New Zealand). The study estimates that up to 26% and 65% of the carbonaceous chondritic component in these layers may originate from extraterrestrial sources, though this proportion is likely overestimated due to potential iridium influx from nearby marine or continental sites. The research utilizes integrated iridium fluencies to assess the extraterrestrial contribution, providing insights into the composition and origin of the boundary clays.

Premovic, P., Ilic, B., & Djordjevic, M. (2012). Iridium anomaly in the cretaceous-paleogene boundary at Højerup (Stevns Klint, Denmark) and Woodside Creek (New Zealand): The question of an enormous proportion of extraterrestrial component. Journal of the Serbian Chemical Society, 77(2), 247–255. https://doi.org/10.2298/jsc110404178p