Tremadocian

Also known as Tremadocian Stage, Tremadocian Age

thumb|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

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Encyclopedic overview

8 sections

Contents

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.

Excerpted from Wikipedia’s “Tremadocian” article, available under the CC BY-SA 4.0 licence.

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