The
Tournaisian, the oldest age of the
Mississippian (also known as Lower Carboniferous) contains eight conodont biozones, two of which are characterized by Siphonodella species:
the zone of Siphonodella quadruplicata and Patrognathus andersoni (upper zone of Patrognathus andersoni)
The
GSSP Golden Spike for the
Tournaisian is in
La Serre,
Montagne Noire, France with the first appearance of Siphonodella sulcata. In 2006 it was discovered that this GSSP has biostratigraphic problems.
References
^Conodonts. EB Branson and MG Mehl, in HW Shimer and RR Shrock, Index Fossils of North America. 1944
^Late Devonian conodonts from northwestern Thailand. Norman M. Savage (2013). Bourland Printing / Trinity Press. pages 1–48,
ISBN978-0-578-11919-9
^New material of the Early Carboniferous conodonts from the lower member of the Baping Formation in Nandong, Guangxi, China. Zhihong Li, Zhongqin Peng, Long Cheng, Chuanshang Wang and Baozhong Wang, Acta Micropalaeontologica Sinica, 2014, volume 31, issue 3, pages 271–284