Roadian
Sign in to saveIn 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
Article
6 sectionsContents
- 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.