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- Stratigraphy of the Cambrian and Ordovician Rocks of East-Central Alaska
- 'Modern' Siliceous Sponges from the Lowermost Ordovician (Early Ibexian - Early Tremadocian) Windfall Formation of the Antelope
- Δ13c Chemostratigraphy in the Upper Tremadocian Through Lower Katian (Ordovician) Carbonate Succession of the Siljan District, Central Sweden
- Marine Redox Variability from Baltica During Extinction Events in the Latest Ordovician–Early Silurian T ⁎ Seth A
- Unexpected Early Triassic Marine Ecosystem and the Rise of the Modern Evolutionary Fauna. Arnaud Brayard, L.J
- GEOLOGIC TIME SCALE V
- A Low Diversity Sinuites Gastropod Community from the Floian, Early Ordovician, of South Wales
- The Late Ordovician
- Brief Report Acta Palaeontologica Polonica 53 (4): 745–749, 2008
- Appendix 3. Age Table Data Dictionary
- 2009 Geologic Time Scale Cenozoic Mesozoic Paleozoic Precambrian Magnetic Magnetic Bdy
- International Stratigraphic Chart
- Back Matter (PDF)
- Furongian Series (Cambrian) Biostratigraphy of Scandinavia – a Revision
- INTERNATIONAL CHRONOSTRATIGRAPHIC CHART International Commission on Stratigraphy V 2020/01
- Carbon Isotope (Δ13ccarb) Stratigraphy of the Lower–Middle Ordovician
- Phanerozoic Geological Evolution of Northern and Central Africa: an Overview
- Δ13c Chemostratigraphy in the Upper Tremadocian Through Lower Katian (Ordovician) Carbonate Succession of the Siljan District, Central Sweden
- The Geologic Time Scale 2012
- Geologic Time Scale
- Late Tremadocian (Early Ordovician)
- Proposed Stratotype for the Base of the Lawsonian Stage (Cambrian Stage 10) at the First Appearance Datum of Eoconodontus Notchp
- Global Stratotype Section and Point for Base of the Ordovician System
- Ordovician of the World
- Tremadocian Ostracods from the Cordillera Oriental, Argentina
- Graptoloid Evolutionary Rates Track Ordovician–Silurian Global Climate Change
- Early Ordovician (Tremadocian) Brachiopods from the Eastern Alborz Mountains, Iran
- Status of Divisions of the International Geologic Time Scale
- The Fezouata Fossils of Morocco; an Extraordinary Record of Marine Life in the Early Ordovicianpeter Van Roy, Derek E
- The Geological Society of America Geologic Time Scale 1888 2013
- Dissecting the Paleocontinental and Paleoenvironmental Dynamics of the Great Ordovician Biodiversiication
- Integrating DNA and Fossils Elucidates the Evolutionary History of Hexactinellid Sponges
- Timing of Infaunalization in Shallow-Marine Early Paleozoic Communities in Gondwanan Settings: Discriminating Evolutionary and Paleogeographic Controls
- The Upper Tremadocian (Lower Ordovician) Graptolite Ancoragraptus from Yiyang, South China
- The New Chronostratigraphic Classification of the Ordovician
- Arabian Orbital Stratigraphy: Periodic Second-Order Sequence Boundaries?
- EARLY PHYLOGENY of CRINOIDS WITHIN the PELMATOZOAN CLADE by WILLIAM I