Katian

Also known as Katian Stage, Katian Age

The Katian is the second stage of the Upper Ordovician. It is preceded by the Sandbian and succeeded by the Hirnantian Stage. The Katian began million years ago and lasted for about 7.6 million years until the beginning of the Hirnantian million years ago. During the Katian the climate cooled which started the Late Ordovician glaciation.

Key facts

Geologic timespan.name: Katian
Geologic timespan.color: Katian
Geologic timespan.time_start: 452.8
Geologic timespan.time_start_uncertainty: 0.7
Geologic timespan.time_end: 445.2
Geologic timespan.time_end_uncertainty: 0.9
Geologic timespan.image_map: Geology of Asia 450.Ma.jpg
Geologic timespan.caption_map: Paleogeography of the Katian, 450 Ma
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 Diplacanthograptus caudatus
Geologic timespan.lower_gssp_location: Black Knob Ridge section, Oklahoma, United States