Devonian radiolarians and tentaculitids from central Laos

► Tentaculitids and radiolarians indicate a Frasnian age for the Ban Phonxai shales. ► Tentaculitids were not previously recorded in either Phan Keo nor Phon Tiou Fm. ► Tentaculitid-radiolarian shales suggests Phon Tiou Fm is present at Ban Phonxai. ► Tentaculitids from the Indochina Terrane are similar to that from South China. ► Tentaculitids may be common and useful in radiolarian chert and shale in SE Asia.