Whiteside, D. I.; Marshall, J. E. A. (2008). "The age, fauna and palaeoenvironment of the Late Triassic fissure deposits of Tytherington, South Gloucestershire, UK". Geological Magazine. 145: 105–147. doi:10.1017/S0016756807003925. S2CID129614690.
Whiteside, D. I.; Marshall, J. E. A. (2008). "The age, fauna and palaeoenvironment of the Late Triassic fissure deposits of Tytherington, South Gloucestershire, UK". Geological Magazine. 145: 105–147. doi:10.1017/S0016756807003925. S2CID129614690.