EntityQ10528257· pop 18· linked from 119 articles

Floian

The Floian is the second stage of the Ordovician Period. It succeeds the Tremadocian with which it forms the Lower Ordovician series. It precedes the Dapingian Stage of the Middle Ordovician. The Floian extended from to million years ago. The lower boundary is defined as the first appearance of the graptolite species Tetragraptus approximatus.

Key facts

Geologic timespan.name: Floian
Geologic timespan.color: Floian
Geologic timespan.time_start: 477.1
Geologic timespan.time_start_uncertainty: 1.2
Geologic timespan.time_end: 471.3
Geologic timespan.time_end_uncertainty: 1.4
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 Graptolite Tetragraptus approximatus
Geologic timespan.lower_gssp_location: Diabasbrottet quarry, Västergötland, Sweden
Geologic timespan.lower_gssp_accept_date: 2002
Geologic timespan.upper_boundary_def: FAD of the Conodont Baltoniodus triangularis

via Wikipedia infobox

Article

7 sections

Contents

History and naming
GSSP
Regional stages
Major events
Paleontology
References
External links

==History and naming== The base of this stage was ratified by the International Commission on Stratigraphy (ICS) in 2002. The Floian Stage is named after Flo, a village in Västergötland, southern Sweden. The name "Floan" was proposed in 2004, but the ICS adapted Floian as the official name of the stage.