A working definition is near the base of the Hybonoticeras hybonotum ammonite zone and lowest occurrence of Gravesia genus, and the base of magnetic polarity chronozone M22An.

Candidates GSSPs are at Mt. Crussol or Canjuers (SE France) and Fornazzo (Sicily, S. Italy).

The convenor of the Tithonian Working Group is Federico Olóriz Sáez, Departamento de Estratigrafía y Paleontología, Facultad de Ciencias – Universidad de Granada, Av. Fuentenueva s/n – 18071 Granada, e-mail: foloriz[AT]ugr.es

Papers on sections that are also relevant include:


Gorodischi section, Ulianovsk area, Russia
  • Rogov M.A. (2010) A precise ammonite biostratigraphy through the Kimmeridgian-Volgian boundary beds in the Gorodischi section (Middle Volga area, Russia), and the base of the Volgian Stage in its type area, Volumina Jurassica. Vol.VIII. P.103-130.
  • Rogov M., Zakharov V. (2014) Russian GSSP Candidate Sections for the Jurassic System // STRATI 2013. First International Congress on Stratigraphy. At the Cutting Edge of Stratigraphy. Springer Geology, P.277-281, DOI 10.1007/978-3-319-04364-7_56.
Kimmeridge Bay, Dorset, UK
  • Gallois, R. W. (2011) A revised description of the lithostratigraphy of the Kimmeridgian-Tithonian and Kimmeridgian-Volgian boundary beds at Kimmeridge, Dorset, UK, Geoscience in South-West England, 12, P.288–294.