[Footnote 99: von Mojsisovics, Dr E., "Faunistische Ergebnisse aus der Untersuchung der Ammoneen-faunen der Mediterranen Trias." _Abhandl. der k. k. Geologisch. Reichsanstalt_, VI. Band 2 Abtheilung. Vienna, 1893.] Series Zonal Divisions --------------+-------------------+-------------------------------------- Rhætic | | 1. Zone of _Avicula Contorta_ --------------+-------------------+-------------------------------------- | | 2. Zone of _Sirenites Argonautae_ | Upper Juvavic | 3. Zone of _Pinnacoceras | | Metternichi_ Juvavic | Middle Juvavic | 4. Zone of _Cyrtopleurites | | bicrenatus_ | | 5. Zone of _Cladiscites ruber_ | Lower Juvavic | 6. Zone of _Sagenites Giebeli_ --------------+-------------------+-------------------------------------- | Upper Carnic | 7. Zone of _Tropites subbullatus_ Carnic | Middle Carnic | 8. Zone of _Trachyceras Aonoides_ | Lower Carnic | 9. Zone of _Trachyceras Aon_ --------------+-------------------+-------------------------------------- | Upper Noric | 10. Zone of _Protrachyceras Noric | | Archelaus_ | Lower Noric | 11. Zone of _Protrachyceras Curionii_ --------------+-------------------+-------------------------------------- | Upper Muschelkalk | 12. Zone of _Ceratiles trinodosus_ Muschelkalk | | | Lower Muschelkalk | 13. Zone of _Ceratiles binodosus_ --------------+-------------------+-------------------------------------- Buntsandstein | Werfener Schichten| 14. Zone of _Tirolites Cassianus_ --------------+-------------------+-------------------------------------- CHAPTER XXII. THE JURASSIC SYSTEM. The Jurassic rocks were formerly separated on account of differences of lithological character into Oolites and Lias, but it was apparent that the Oolites were more important than the Lias, and a fourfold division was made into:-- Upper or Portland Oolites } Middle or Oxford Oolites } = Malm Lower or Bath Oolites = Dogger Lias. The Lias strata have also been spoken of as the Black Jura, the Lower Oolites and part of the Oxford Oolites as Brown Jura, and the rest of the Oxford Oolites with the Portland Oolites as White Jura. As the outcome of a detailed study of the faunas of the Jurassic rocks, a further subdivision has been made, partly based upon the original British series, but the divisions are defined with greater accuracy, so that they are applicable over wider areas. They are as follows:-- { Purbeckian Upper Oolites { Portlandian { Kimmeridgian