KimmeridgianSubdivision of the Jurassic according to the ICS, as of 2024.Vertical axis scale: Millions of years agoEtymologyName formalityFormalUsage informationCelestial bodyEarthRegional usageGlobal (ICS)Time scale(s) usedICS Time ScaleDefinitionChronological unitAgeStratigraphic unitStageTime span formalityFormalLower boundary definitionFAD of the AmmonitePictonia bayleiLower boundary GSSPFlodigarry, Skye, Scotland, UK57°39′40″N6°14′44″W / 57.6610°N 6.2455°W / 57.6610; -6.2455Lower GSSP ratified2021Upper boundary definitionNot formally definedUpper boundary definition candidatesBase of magnetic polarity chronozone M22An.FAD of the Ammonite genus GravesiaUpper boundary GSSP candidate section(s), FranceCanjuers, France, Sicily, ItalyIn the geologic timescale, the Kimmeridgian is an age in the Late JurassicEpoch and a stage in the Upper Jurassic Series.
OxfordCity and district in Oxfordshire, EnglandCity and non-metropolitan district in EnglandOxford ( ) is a cathedral city and non-metropolitan district in Oxfordshire, England, of which it is the county town. The city is home to the University of Oxford, the oldest university in the English-speaking world; it has buildings in every style of English architecture since late Anglo-Saxon.CallovianIn the geologic timescale, the Callovian is an age and stage in the Middle Jurassic, lasting between 165.3 ± 1.1 Ma (million years ago) and 161.5 ± 1.0 Ma. It is the last stage of the Middle Jurassic, following the Bathonian and preceding the Oxfordian.
Stage (stratigraphy)In chronostratigraphy, a stage is a succession of rock strata laid down in a single age on the geologic timescale, which usually represents millions of years of deposition. A given stage of rock and the corresponding age of time will by convention have the same name, and the same boundaries. Rock series are divided into stages, just as geological epochs are divided into ages.
Late JurassicThe Late Jurassic is the third epoch of the Jurassic period, and it spans the geologic time from 161.5 ± 1.0 to 143.1 ± 0.6 million years ago (Ma), which is preserved in Upper Jurassic strata. In European lithostratigraphy, the name "Malm" indicates rocks of Late Jurassic age.
DorsetCounty of EnglandCeremonial county in EnglandDorset ( ; archaically: Dorsetshire , ) is a ceremonial county in South West England. It is bordered by Somerset to the north-west, Wiltshire to the north and the north-east, Hampshire to the east, the Isle of Wight across the Solent to the south-east, the English Channel to the south, and Devon to the west. The largest settlement is Bournemouth.
Weymouth, DorsetTown in Dorset, EnglandTown and civil parish in EnglandWeymouth ( ) is a seaside town and civil parish in the Dorset district, in the ceremonial county of Dorset, England. Situated on a sheltered bay at the mouth of the River Wey, 7 miles (11 km) south of the county town of Dorchester, Weymouth had a population of 53,416 in 2021. It is the third-largest settlement in Dorset after Bournemouth and Poole.
Alcide d'OrbignyAlcide Charles Victor Marie Dessalines d'Orbigny (French pronunciation:; 6 September 1802 – 30 June 1857) was a French naturalist who made major contributions in many areas, including zoology (including malacology), palaeontology, geology, archaeology and anthropology. D'Orbigny was born in Couëron (Loire-Atlantique), the son of a ship's physician and amateur naturalist.
YorkshireHistoric county of EnglandYorkshire ( ) is an area of Northern England which was historically a county. Despite no longer being used for administration, Yorkshire retains a strong regional identity. The county was named after the city of York. The south-west of Yorkshire includes the cities of Leeds, Sheffield, Bradford, Doncaster and Wakefield.Series (stratigraphy)Series are subdivisions of rock layers based on the age of the rock and formally defined by international conventions of the geological timescale. A series is therefore a sequence of strata defining a chronostratigraphic unit. Series are subdivisions of systems and are themselves divided into stages.
International Commission on StratigraphyThe International Commission on Stratigraphy (ICS), sometimes unofficially referred to as the International Stratigraphic Commission, is a daughter or major subcommittee grade scientific organization that concerns itself with stratigraphical, geological, and geochronological matters, worldwide. It is the largest subordinate body of the International Union of Geological Sciences (IUGS).
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