[B-PT27] End-Proterozoic/Phanerozoic biodiversity change: extinction and radiation

[BPT27-P02] Middle-Late Ordovician biodiversification and relevant environmental changes in Estonia

*Momoko SHIMATSUKA¹, Yukio ISOZAKI², Tomomi KANI³, Akira ISHIKAWA⁴ (1.Department of Earth and Planetary Science - Graduate School of Science, The University of Tokyo, 2.Department of Earth Science and Astronomy, Multi-disciplinary Sciences - General Systems Studies, Gr, 3.Department of Earth and Environmental Sciences, Kumamoto University, 4.Department of Earth Science and Astronomy, The University of Tokyo)

Following up the 'Cambrian explosion' , marine biodiversity increased dramatically during the Ordovician, as known as the 'Great Ordovician Biodiversification Event' (GOBE). Estonia in central Batoscandia provides excellently continuous Ordovician sedimentary package for detailed analysis. We are analyzing the drilled core samples of the Middle-Upper Ordovician strata (ca. 150 m-thick) collected from Velise in central Estonia, in order to clarify litho-, bio-, and isotope stratigraphy of C and Sr, and to reveal the cause and processes of the GOBE. We will report on our preliminary results.