Tremadocian
Sign in to savethumb|Rock from the Skiddaw Group, of Ordovician (Tremadocian) age, at Scawgill Bridge quarry in [[Cumbria, England, UK]]
Key facts
- Geologic timespan.name
- Tremadocian
- Geologic timespan.color
- Tremadocian
- Geologic timespan.time_start
- 486.85
- Geologic timespan.time_start_uncertainty
- 1.5
- Geologic timespan.time_end
- 477.1
- Geologic timespan.time_end_uncertainty
- 1.2
- Geologic timespan.timeline
- Ordovician
- Geologic timespan.name_formality
- Formal
- Geologic timespan.celestial_body
- earth
- Geologic timespan.usage
- Global (ICS)
- Geologic timespan.timescales_used
- ICS Time Scale
- Geologic timespan.chrono_unit
- Age
- Geologic timespan.strat_unit
- Stage
- Geologic timespan.timespan_formality
- Formal
- Geologic timespan.lower_boundary_def
- FAD of the Conodont Iapetognathus fluctivagus.
- Geologic timespan.lower_gssp_location
- Greenpoint section, Green Point, Newfoundland, Canada
- Geologic timespan.lower_gssp_accept_date
- 2000
- Geologic timespan.upper_boundary_def
- FAD of the Graptolite Tetragraptus approximatus
via Wikipedia infobox
Article
8 sectionsContents
- Naming
- GSSP
- Regional stages
- Major events
- Tremadocian life
- Ocean and climate
- References
- External links
thumb|Rock from the Skiddaw Group, of Ordovician (Tremadocian) age, at Scawgill Bridge quarry in [[Cumbria, England, UK]]
The Tremadocian is the lowest stage of Ordovician. Together with the later Floian Stage it forms the Lower Ordovician Epoch. The Tremadocian lasted from to million years ago. The base of the Tremadocian is defined as the first appearance of the conodont species Iapetognathus fluctivagus at the Global Boundary Stratotype Section and Point (GSSP) section on Newfoundland.