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Information about Hettangian

The Hettangian is the first stage of the Early Jurassic Epoch. It spans the time between 199.6 ± 0.6 Ma and 196.5 ± 1 Ma (million years ago). The stage follows the Rhaetian Stage of the Triassic Period.

The stage takes its name from Hettange-Grande, a town in northern France, just south of the border with Luxembourg on the main road from Luxembourg City to Metz.

In Europe this period, together with the Sinemurian, is also known as the Lower (or Blue) Lias Stage.

Fauna

References

Jurassic period
Lower/Early Jurassic Middle Jurassic Upper/Late Jurassic
Hettangian | Sinemurian
Pliensbachian | Toarcian		Aalenian | Bajocian
Bathonian | Callovian		Oxfordian | Kimmeridgian
Tithonian
Faunal stages are subdivisions of rock layers used primarily by paleontologists who study fossils rather than by geologists who study rock formations. Typically, a faunal stage will consist of a series of rocks that contain similar fossils.
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Early Jurassic (in geology referred to as the Lower Jurassic, originally (and still in Europe) the "Lias") is the earliest of three epochs of the Jurassic period.
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The geological time scale is used by geologists and other scientists to describe the timing and relationships between events that have occurred during the history of Earth.
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Annum is a Latin noun meaning year. It is the accusative singular of the second declension masculine noun annus (nominative), anni (genitive) [1] .

As a unit of time, it is defined as exactly 365.
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Rhaetian Stage is the most recent stage of the Late Triassic. It occurred 203.6 ± 1.5 – 199.6 ± 0.6 million years ago.

Paleogeography

At this stage, Pangaea began to break-up, though Atlantic Ocean was formed yet.
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The Triassic is a geologic period that extends from about 251 to 199 Ma (million years ago). As the first period of the Mesozoic Era, the Triassic follows the Permian and is followed by the Jurassic. Both the start and end of the Triassic are marked by major extinction events.
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Hettange-Grande

Headquarters of the 40th Transmission Regiment, based in Hettange-Grande
Location

Coordinates
Time Zone CET (GMT +1)

Administration
Country
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Motto
Liberté, Égalité, Fraternité
"Liberty, Equality, Fraternity"
Anthem
"La Marseillaise"


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Motto
"Mir wëlle bleiwe wat mir sinn"   (Luxembourgish)
"We want to remain what we are"
Anthem
Ons Hémécht
"Our Homeland"
Royal anthem
De Wilhelmus  1
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Ville de Metz

City flag City coat of arms

Motto: Si paix dedans, paix dehors
(French: If peace inside, peace outside)

Cathedral St.
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The Sinemurian is a stage of the Early Jurassic Epoch. It spans the time between 196.5 ± 2 Ma and 189.6 ± 1.5 Ma (million years ago).

The stage takes its name from the town of , near Sancerre in the upper Loire Valley.
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Blue Lias is a sequence of layers of limestones and shales, laid down in Jurassic times, between 195 and 200 million years ago. In geology, it corresponds with the Hettangian stage of the Jurassic.
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Abrictosaurus
Hopson, 1975

Species
  • A. consors
    (Thulborn, 1974)


Abrictosaurus (IPA /ɑˌbɹɪktoʊˈsɔrəs/
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The Jurassic Period is a major unit of the geologic timescale that extends from about 199.6 ± 0.6 Ma (million years ago) to 145.4 ± 4.0 Ma, the end of the Triassic to the beginning of the Cretaceous.
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Early Jurassic (in geology referred to as the Lower Jurassic, originally (and still in Europe) the "Lias") is the earliest of three epochs of the Jurassic period.
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The Middle Jurassic, called the Dogger in the European system of classification, is the second epoch of the Jurassic Period. It lasted from 180-154 million years ago.

Paleogeograpgy

Pangaea began to separate into Laurasia and Gondwana and the Atlantic Ocean formed.
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Late Jurassic (or Malm) Epoch of the Jurassic Period is the unit of geologic time from 161.2 ± 4.0 to 145.5 ± 4.0 million years ago, which is preserved in Upper Jurassic strata.
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The Sinemurian is a stage of the Early Jurassic Epoch. It spans the time between 196.5 ± 2 Ma and 189.6 ± 1.5 Ma (million years ago).

The stage takes its name from the town of , near Sancerre in the upper Loire Valley.
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The Pliensbachian (also known as Charmouthian) is a stage of the Early Jurassic Epoch. It spans the time between 189.6 ± 1.5 Ma and 183 ± 1.5 Ma (million years ago).

The stage takes its name from the town of Pliensbach, some 30 km east of Stuttgart in Germany.
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The Toarcian Stage was the last faunal stage of the Early Jurassic period. It is usually used to cover the period from 183 Ma to 175 Ma (million years ago).

The Toarcian stage began with the Toarcian turnover, the extinction event that set it apart from the previous
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The Aalenian (IPA: /ɑːˈliːniən/) is a subdivision of the Middle Jurassic epoch of the geologic timescale that extends from about 175.6 Ma to about 171.6 Ma (million years ago).
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In the geologic timescale, the Bajocian is an age of the Middle Jurassic epoch of the Jurassic period of the Mesozoic era of the Phanerozoic eon. It lasted from approximately 171.6 Ma to around 167.7 Ma (million years ago).
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In the geologic timescale the Bathonian epoch is a stage during the Middle Jurassic, of the Mesozoic era of the Phanerozoic eon. It lasted from approximately 167.7 Ma to around 164.7 Ma (million years ago). The Bathonian age succeeds the Bajocian age and precedes the Callovian age.
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The Callovian is a stage on the geologic time scale occurring 164.7 ± 4.0 Ma to 161.2 ± 4.0 Ma (million years ago). It is the last stage of the Middle Jurassic.

The stage takes its name from an old spelling of Kellaways Bridge, 3 km north-east of Chippenham in Wiltshire in
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The Oxfordian stage is the first stage of the Late Jurassic Epoch. It spans the time between 161.2 ± 4 Ma and 155.7 ± 4 Ma (million years ago).

The stage takes its name from the city of Oxford in England.
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The Kimmeridgian is a stage of the Late Jurassic Epoch. It spans the time between 155.7 ± 4 Ma and 150.8 ± 4 Ma (million years ago).

The stage takes its name from the village of Kimmeridge on the Dorset coast, England where the exposure is at its greatest extent.
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The Tithonian is the final stage of the Late Jurassic Epoch. It spans the time between 150.8 ± 4 Ma and 145.5 ± 4 Ma (million years ago). It is followed by the Berriasian stage of the Early Cretaceous Epoch.
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