Lower Permian conodonts from Palaeo-Tethys Ocean Plate Stratigraphy in the Chiang Mai-Chiang Rai Suture Zone, northern Thailand

• Section of Palaeo-Tethys Ocean Plate Stratigraphy (OPS) in N Thailand described.
• OPS dated as Lower Permian (lower Sakmarian) by conodonts.
• Palaeo-Tethys suture in N Thailand named Chiang Mai-Chiang Rai Suture Zone.