Middle Jurassic (174.1 +/-1.0 Ma)

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Representation and status

Color CMYK
50 / 0 / 5 / 0
Color RGB
R: 128 G: 207 B: 216
Rank
chronostratigraphic Epoch
Validity
Unit is in Use
Status
valid formal name
Status discussion

Nomenclature

Deutsch
Mittlerer Jura
Français
Jurassique moyen
Italiano
Giurassico medio
English
Middle Jurassic (174.1 +/-1.0 Ma)
Historical Variants

Mésojurassique (Lugeon 1910), Série médiojurassique (Revil), Dogger [sic]

Age

Age at top
  • Callovian
Age at base
  • Aalenian
  • Callovian (166.1 +/-1.2 Ma)

    Name Origin

    Named derived from the old spelling of Kellaways Bridge (UK), Wiltshire, 2 miles NE Chippenham.

    Rank
    chronostratigraphic Stage
    Status
    valid formal name
    In short

    Last stage of the Middle Jurassic.

    Age
    Callovian
  • Bathonian (168.3 +/-1.3 Ma)

    Name Origin

    Named after the town of Bath (Somerset, UK), near Bristol. The city itself is largely built of Bath Stone, a bright white oolithic limestone that is quarried nearby.

    Rank
    chronostratigraphic Stage
    Status
    valid formal name
    In short

    Third stage of the Middle Jurassic.

    Age
    Bathonian
  • Bajocian (170.3 +/-1.4 Ma)

    Name Origin

    Named after the town of Bayeux (Calvados, France) in Normandy.

    Rank
    chronostratigraphic Stage
    Status
    valid formal name
    Nomenclatorial Remarks
    <p>Latin: Bajocium</p>
    In short

    Second stage of the Middle Jurassic.

    Age
    Bajocian
    • Gaetani Oceanic Anoxic Event

      Name Origin

      Named in recognition of Maurizio Gaetani's work on Jurassic sedimentary successions of the Lombardy Basin.

      Rank
      Oceanic Anoxic Event
      Status
      informal term
      In short

      Black shale interval locally developped at the transition betwenn the Rosso Ammonitico Lombardo and the Radiolarite Group.

      Age
      early Bajocian
  • Aalenian (174.1 +/-1.0 Ma)

    Name Origin

    Named after the town of Aalen (Germany), Baden-Württemberg

    Rank
    chronostratigraphic Stage
    Status
    valid formal name
    In short

    First stage of the Middle Jurassic.

    Age
    Aalenian
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