The Ordovician and Silurian were warm greenhouse periods, with the highest sea levels of the Paleozoic (200 m above today's); the warm climate was interrupted only by a 30 million year cool period, the Early Palaeozoic Icehouse, culminating in the Hirnantian glaciation, 445 million years ago at the end of the Ordovician.
Periode Ordovisium dan Silur merupakan periode “rumah kaca”, dengan permukaan air laut tertinggi dari Paleozoikum (200m lebih daripada hari ini); iklim hangat hanya disela oleh periode dingin selama 30 juta tahun, yakni Awal Paleozoikum Icehouse, yang berpuncak pada glasiasi Hirnantian.WikiMatrix WikiMatrix