Oxfordian (stage)

A request that this article title be changed to Oxfordian (geology) is under discussion. Please do not move this article until the discussion is closed.

Oxfordian
161.5 ± 1.0 – 154.8 ± 0.8 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Cyclically alternating limestone (light, more competent) and marl/clay layers of Oxfordian age at Péry-Reuchenette, near Tavannes, Jura Mountains, Switzerland.
Chronology
−205 — – −200 — – −195 — – −190 — – −185 — – −180 — – −175 — – −170 — – −165 — – −160 — – −155 — – −150 — – −145 — – −140 — Mesozoic T Jurassic K LT Early Middle Late EK Rhaetian Hettangian Sinemurian Pliensbachian Toarcian Aalenian Bajocian Bathonian Callovian Oxfordian Kimmeridgian Tithonian Berriasian       ← Triassic–Jurassic extinction event Subdivision of the Jurassic according to the ICS, as of 2024.[1] Vertical axis scale: Millions of years ago
Etymology
Name formality	Formal
Usage information
Celestial body	Earth
Regional usage	Global (ICS)
Time scale(s) used	ICS Time Scale
Definition
Chronological unit	Age
Stratigraphic unit	Stage
Time span formality	Formal
Lower boundary definition	FAD of ammonite species Brightia thuouxensis
Lower boundary definition candidates	Horizon of the Ammonite Cardioceras redcliffense.
Lower boundary GSSP candidate section(s)	Redcliff Point, Dorset, UK Savouron, Provence, France
Upper boundary definition	FAD of the Ammonite Pictonia baylei
Upper boundary GSSP	Flodigarry, Skye, Scotland, UK 57°39′40″N 6°14′44″W / 57.6610°N 6.2455°W / 57.6610; -6.2455
Upper GSSP ratified	2021[2]

The Oxfordian is, in the ICS' geologic timescale, the earliest age of the Late Jurassic Epoch, or the lowest stage of the Upper Jurassic Series. It spans the time between 161.5 ± 1.0 Ma and 154.8 ± 0.8 Ma (million years ago).^[3] The Oxfordian is preceded by the Callovian and is followed by the Kimmeridgian.