Oxfordian (stage) - Stratigraphic Definitions

Stratigraphic Definitions

The Oxfordian stage was introduced into scientific writing by Alexandre Brongniart in 1827. The stage takes its name from the city of Oxford in England.

The base of the Oxfordian stage is defined as the point in the stratigraphic record where the ammonite species Brightia thuouxensis first appears. A global reference profile for the base (a GSSP) had in 2009 not yet been assigned. The top of the Oxfordian stage (the base of the Kimmeridgian) is at the first appearance of ammonite species Pictonia baylei.

In the Tethys domain, the Oxfordian contains six ammonite biozones:

  • zone of Epipeltoceras bimammatum
  • zone of Perishinctes bifurcatus
  • zone of Gregoryceras transversarium
  • zone of Perisphinctes plicatilis
  • zone of Cardioceras cordatum
  • zone of Quenstedtoceras mariae

Read more about this topic:  Oxfordian (stage)

Famous quotes containing the word definitions:

    What I do not like about our definitions of genius is that there is in them nothing of the day of judgment, nothing of resounding through eternity and nothing of the footsteps of the Almighty.
    —G.C. (Georg Christoph)