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Roadian
EntityQ1051453· pop 20· linked from 138 articles

Roadian

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Also known as Roadian Stage, Roadian Age

In the geologic timescale, the Roadian is an age or stage of the Permian. It is the earliest or lower of three subdivisions of the Guadalupian Epoch or Series. The Roadian lasted between and million years ago (Ma). It was preceded by the Kungurian and followed by the Wordian.

Key facts

Geologic timespan.name
Roadian
Geologic timespan.color
Roadian
Geologic timespan.time_start
274.4
Geologic timespan.time_start_uncertainty
0.4
Geologic timespan.time_end
266.9
Geologic timespan.time_end_uncertainty
0.4
Geologic timespan.image_map
File:270Ma Mollweide.png
Geologic timespan.caption_map
Mollweide map of Earth 270 million years ago, with black outlines depicting countries in their locations
Geologic timespan.timeline
Permian
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 Jinogondolella nanginkensis
Geologic timespan.lower_gssp_location
Stratotype Canyon, Guadalupe Mountains, Texas, USA

via Wikipedia infobox

Wikidata facts

Instance of
age
Followed by
Wordian
Follows
Kungurian
Show 4 more facts
sRGB color hex triplet
FE8E72
start time
272950000-
end time
268800000-
Commons category
Roadian
Sources (4)

via Wikidata · CC0

~2 min read

Encyclopedic overview

6 sections
Contents
  • Stratigraphy
  • Life
  • Notable formations
  • References
  • Literature
  • External links

In the geologic timescale, the Roadian is an age or stage of the Permian. It is the earliest or lower of three subdivisions of the Guadalupian Epoch or Series. The Roadian lasted between and million years ago (Ma). It was preceded by the Kungurian and followed by the Wordian.

==Stratigraphy== In 1961, the regional timescale used for the southeastern US had the Wordian and Capitanian as subdivisions of the Guadalupian. Efforts to correlate the Permian stratigraphy of the southeastern US with that of Russia led to the conclusion that between the Wordian stage and the Russian Artinskian stage, another stage needed to be introduced. This stage, the Roadian Stage, was established in 1968 and took its name from the Road Canyon Formation in Brewster County, Texas, formerly considered the lower (oldest) part of the Word Formation. The stage was added to the internationally used IUGS timescale in 2001.

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

On the map

6 mapped locations

Available in 19 languages

via Wikidata sitelinks · CC0