Sandbian

Also known as Sandbian Stage, Sandbian Age

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

Key facts

Geologic timespan.name: Sandbian
Geologic timespan.color: Sandbian
Geologic timespan.time_start: 458.2
Geologic timespan.time_start_uncertainty: 0.7
Geologic timespan.time_end: 452.8
Geologic timespan.time_end_uncertainty: 0.7
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 Nemagraptus gracilis
Geologic timespan.lower_gssp_location: Fågelsång section, Sularp Brook, Skåne, Sweden
Geologic timespan.lower_gssp_accept_date: 2002
Geologic timespan.upper_boundary_def: FAD of the Graptolite Diplacanthograptus caudatus