Sandbian
Template:Short description Template:Infobox geologic timespan
The Sandbian is the first stage of the Upper Ordovician. It follows the Darriwilian and is succeeded by the Katian. Its lower boundary is defined as the first appearance datum of the graptolite species Nemagraptus gracilis around Expression error: Unexpected round operator million years ago. The Sandbian lasted for about 5.4 million years until the beginning of the Katian around Expression error: Unexpected round operator million years ago.[1]
Naming
The name Sandbian is derived from the village Södra Sandby (Lund Municipality, Skåne County, Sweden). The name was proposed in 2006.[2]
GSSP
The GSSP of the Sandbian is the Fågelsång section (Lua error: callParserFunction: function "#coordinates" was not found.) at Sularp Brook, east of Lund (Skåne, Sweden). It is an outcrop of shale and mudstone. The lower boundary of the Sandbian is defined as the first appearance datum of graptolite species Nemagraptus gracilis in that section.[3]
References
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- ^ Page Module:Citation/CS1/styles.css has no content."GSSP Table - Paleozoic Era". Geologic Timescale Foundation. Retrieved 2 December 2012.
- ^ Page Module:Citation/CS1/styles.css has no content.Bergström, Stig; Finney, Stanley; Xu, Chen; Goldman, Daniel; Leslie, Stephen (31 August 2006). "Three new Ordovician global stage names". Lethaia. 39 (3): 287–288. doi:10.1080/00241160600847439.
- ^ Page Module:Citation/CS1/styles.css has no content.Bergström, Stig M.; S. C. Finney; Chen Xu; Christian Pålsson; Wang Zhi-hao; Yngve Grahn (2000). "A proposed global boundary stratotype for the base of the Upper Series of the Ordovician System: The Fågelsång section, Scania, southern Sweden" (PDF). Episodes. 23 (2): 102–109. doi:10.18814/epiiugs/2000/v23i2/003. Retrieved 20 September 2012.
