来源：Gradstein, F. M., F. P. Agterberg, J. G. Ogg, J. Hardenbol, P. van Veen, J. Thierry & Z. Huang. 1995. A Triassic, Jurassic and Cretaceous time scale, pp. 95-126. IN W. A. Bergren, D. V. Kent, M.-P. Aubry & J. Hardenbol (eds.), Geochronology, Time Scales, and Global Stratigraphic Cor