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Sandbian

Sandbian

−485 —–−480 —–−475 —–−470 —–−465 —–−460 —–−455 —–−450 —–−445 —–@supports(writing-mode:vertical-lr){.mw-parser-output .ts-vertical-text{letter-spacing:-0.12em;line-height:1em;text-orientation:upright;writing-mode:vertical-lr;width:1em}}PaleozoicOrdovicianSEarlyMiddleLateLTremadocianFloianDapingianDarriwilianSandbianKatianHirnantianRhuddanianꞒFStage 10 ←First land plant spores←Ordovician meteor eventSubdivision of the Ordovician according to the ICS, as of 2024.Vertical axis scale: Millions of years ago	−485 —–−480 —–−475 —–−470 —–−465 —–−460 —–−455 —–−450 —–−445 —–	@supports(writing-mode:vertical-lr){.mw-parser-output .ts-vertical-text{letter-spacing:-0.12em;line-height:1em;text-orientation:upright;writing-mode:vertical-lr;width:1em}}PaleozoicOrdovicianSEarlyMiddleLateLTremadocianFloianDapingianDarriwilianSandbianKatianHirnantianRhuddanianꞒFStage 10	←First land plant spores←Ordovician meteor event	←	First land plant spores	←	Ordovician meteor event	Subdivision of the Ordovician according to the ICS, as of 2024.Vertical axis scale: Millions of years ago
−485 —–−480 —–−475 —–−470 —–−465 —–−460 —–−455 —–−450 —–−445 —–	@supports(writing-mode:vertical-lr){.mw-parser-output .ts-vertical-text{letter-spacing:-0.12em;line-height:1em;text-orientation:upright;writing-mode:vertical-lr;width:1em}}PaleozoicOrdovicianSEarlyMiddleLateLTremadocianFloianDapingianDarriwilianSandbianKatianHirnantianRhuddanianꞒFStage 10	←First land plant spores←Ordovician meteor event	←	First land plant spores	←	Ordovician meteor event
←	First land plant spores
←	Ordovician meteor event
Subdivision of the Ordovician according to the ICS, as of 2024.Vertical axis scale: Millions of years ago
Formal
Earth
Global (ICS)
ICS Time Scale
Age
Stage
Formal
FAD of the Graptolite Nemagraptus gracilis
Fågelsång section, Sularp Brook, Skåne, Sweden.mw-parser-output .geo-default,.mw-parser-output .geo-dms,.mw-parser-output .geo-dec{display:inline}.mw-parser-output .geo-nondefault,.mw-parser-output .geo-multi-punct,.mw-parser-output .geo-inline-hidden{display:none}.mw-parser-output .longitude,.mw-parser-output .latitude{white-space:nowrap}55°42′49″N 13°19′32″E / 55.7137°N 13.3255°E / 55.7137; 13.3255
2002
FAD of the Graptolite Diplacanthograptus caudatus
Black Knob Ridge section, Oklahoma, United States34°25′50″N 96°04′29″W / 34.4305°N 96.0746°W / 34.4305; -96.0746
2006

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 458.2 million years ago. The Sandbian lasted for about 5.4 million years until the beginning of the Katian around 452.8 million years ago.

The name Sandbian is derived from the village Södra Sandby (Lund Municipality, Skåne County, Sweden). The name was proposed in 2006.

The GSSP of the Sandbian is the Fågelsång section (55°42′49″N 13°19′32″E / 55.7137°N 13.3255°E / 55.7137; 13.3255) 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 speciesNemagraptus gracilis in that section.

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