Tremadocian
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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