Catlos, E.J., Mark, D.F., Suarez, S.E., Brookfield, M.E., Miller, C.G., Schmitt, A.K., Gallagher, V., Kelly, A. (2020). Late Silurian zircon U–Pb ages from the Ludlow and Downton bone beds, Welsh Basin, UK Journal of the Geological Society, 178, jgs2020-107.
