Jim Ogg is a Professor in the Department Earth and Atmospheric Sciences at Purdue University and has served as Secretary-General of the International Commission on Stratigraphy since 2000. As part of this role he developed the TimeScale Creator databases and visualization system (freely available at www.stratigraphy.org). His research specialties include Mesozoic marine stratigraphy, paleomagnetism, and climate cycles. Gabi Ogg is a micropaleontologist and is responsible for the many time scale charts and other graphics in this book and numerous other publications. Felix Gradstein is Professor of Stratigraphy and Micropaleontology at the Geology Department of the Natural History Museum of Oslo University. He was chair of the International Commission on Stratigraphy from 2000 to 2008, and under his tenure major progress was made with the definition and ratification and international acceptance of chronostratigraphic units from Precambrian through to Quaternary.

'… practical … can be reliably recommended for any geologist who regularly refers to the time scale.' Geological Magazine

• Introduction; Planetary time scale; Precambrian period; Cambrian period; Ordovician period; Silurian period; Devonian period; Carboniferous period; Permian period; Triassic period; Jurassic period; Cretaceous period; Paleogene period; Neogene period; Quaternary period; Appendix. Standard colors of the international divisions of geologic time; References; Index.

Jim Ogg is a Professor in the Department Earth and Atmospheric Sciences at Purdue University and has served as Secretary-General of the International Commission on Stratigraphy since 2000. As part of this role he developed the TimeScale Creator databases and visualization system (freely available at www.stratigraphy.org). His research specialties include Mesozoic marine stratigraphy, paleomagnetism, and climate cycles. Gabi Ogg is a micropaleontologist and is responsible for the many time scale charts and other graphics in this book and numerous other publications. Felix Gradstein is Professor of Stratigraphy and Micropaleontology at the Geology Department of the Natural History Museum of Oslo University. He was chair of the International Commission on Stratigraphy from 2000 to 2008, and under his tenure major progress was made with the definition and ratification and international acceptance of chronostratigraphic units from Precambrian through to Quaternary.

'… practical … can be reliably recommended for any geologist who regularly refers to the time scale.' Geological Magazine

• Introduction; Planetary time scale; Precambrian period; Cambrian period; Ordovician period; Silurian period; Devonian period; Carboniferous period; Permian period; Triassic period; Jurassic period; Cretaceous period; Paleogene period; Neogene period; Quaternary period; Appendix. Standard colors of the international divisions of geologic time; References; Index.