GCMD Chronostratigraphic Units Types Keywords

HETTANGIAN

https://gcmd.earthdata.nasa.gov/kms/concept/fb29222e-8aaf-4b46-8672-8525a58e2b8d

broader
https://gcmd.earthdata.nasa.gov/kms/concept/bc9f3b87-69ff-4841-a227-309c69c952c2 original
narrower
fb29222e-8aaf-4b46-8672-8525a58e2b8d original
change note
2019-10-09 07:50:31.0 [tstevens] Insert Concept
add broader relation (HETTANGIAN [fb29222e-8aaf-4b46-8672-8525a58e2b8d,369349] - LOWER [bc9f3b87-69ff-4841-a227-309c69c952c2,369305]);
2019-10-11 12:45:03.0 [tstevens]
insert Definition (id: null
text: The Hettangian is the earliest age and lowest stage of the Jurassic period of the geologic timescale. It spans the time between 201.3 ± 0.2 Ma and 199.3 ± 0.3 Ma (million years ago). The Hettangian follows the Rhaetian (part of the Triassic period) and is followed by the Sinemurian.

In European stratigraphy the Hettangian is a part of the time span in which the Lias was deposited. An example is the British Blue Lias, which has an upper Rhaetian to Sinemurian age. Another example is the lower Lias from the Northern Limestone Alps where well-preserved but very rare ammonites, including Alsatites, have been found.
language code: en);
definition The Hettangian is the earliest age and lowest stage of the Jurassic period of the geologic timescale. It spans the time between 201.3 ± 0.2 Ma and 199.3 ± 0.3 Ma (million years ago). The Hettangian follows the Rhaetian (part of the Triassic period) and is followed by the Sinemurian.

In European stratigraphy the Hettangian is a part of the time span in which the Lias was deposited. An example is the British Blue Lias, which has an upper Rhaetian to Sinemurian age. Another example is the lower Lias from the Northern Limestone Alps where well-preserved but very rare ammonites, including Alsatites, have been found.
reference
text International Commission on Stratigraphy (http://www.stratigraphy.org/)
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in scheme chronounits original