The radiolarian faunal transition just after the Paleozoic/Mesozoic Boundary.

放射虫是古生代和中生代海洋中的主要浮游生物类群。在古生代/中生代界线，放射虫动物群发生了显著的变化，当时发生了最大的生物灭绝。虽然放射虫动物群变化的细节长期以来一直不为人知，但通过对新西兰阿罗岩的地质和古生物调查，已经澄清了许多二叠纪放射虫跨越边界幸存下来。在这项研究中，我提取放射虫组合约15个最早的三叠纪层位箭头岩石硅质岩。这些放射虫动物群基本上由二叠纪的种类组成，并在早三叠世逐渐向中生代的种类转变。

Radiolarians were the principal plankton group within the Paleozoic and Mesozoic Ocean. The radiolarian fauna remarkably changes across the Paleozoic/Mesozoic boundary, when the biggest mass extinction occurred. Although the detail of the radiolarian faunal change had long been obscured, it had been clarified through the geological and paleontological survey of Arrow Rocks, New Zealand that many Permian radiolarians survived across the boundary. In this study, I extracted radiolarian assemblages from about fifteen earliest Triassic horizons in Arrow Rocks cherts. These radiolarian fauna was almost composed of Permian-type species, and changed gradually to Mesozoic-type fauna in Early Triassic time.