Bulletin of the Geological Society of Malaysia, Volume 8, Dec, 1977, pp. 109 – 111
Geological Survey of Malaysia, Sabah
A Lower Cretaceous age obtained from a radiolarian chert of the Chert-Spilite Formation indicates that the Upper Cretaceous lower age limit of the formation, at least in Eastern Sabah, should be reviewed and revised.
https://doi.org/10.7186/bgsm08197707
