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a two-substage subdivision is common:
* Julian
* Tuvalianothers prefer a three-substage organization of the stage as follows:
* Cordevolian
* Julian
* Tuvalian

Biostratigraphy

In the Tethys domain, the Carnian Stage contains six ammonite biozones:
* zone of Anatropites spinosus
* zone of Tropites subbullatus
* zone of Tropites dilleri
* zone

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