Jain et al., 1984
From dinoflaj2
Jain, K.P., Garg, R., Kumar, S. and Singh, I.B., 1984: Upper Jurassic dinoflagellate biostratigraphy of Spiti Shale (Formation), Malla Johar area, Tethys Himalaya, India. Journal of the Palaeontological Society of India, v.29, p.67-83, pl.1-6.
