Ordovician timescale in Estonia: recent developments

Abstract

Over 150 years of progress in the Ordovician geology and strati- graphy of Estonia has resulted in one of the most precise Ordovician timescales in the world. In this paper, an up-to-date version of the Ordovician timescale of Estonia is provided. Recent developments in graptolite, chitinozoan, and conodont biostratigraphy, and the correlation with the global standard are briefly commented upon. Application of the regional subseries rank is discussed and two new names are proposed: Vinni for the upper subseries of the Viru Series, and Atla for the upper subseries of the Harju Series.