1. Some new species of Cryptolithus, (s.l.), from the Upper Ordovician;Bancroft;Memoirs and Proceedings of the Manchester Literary and Philosophical Society,1929
2. Salterolithus caractaci (Murchison) from Caradoc strata near Welshpool, Montgomeryshire;Cave;Geological Magazine,1957
3. Cocks , L. R. M. 1978 A review of British Lower Palaeozoic Brachiopods including a synoptic revision of Davidson's Monograph Palaeontographical Society (Monograph)
4. The Ordorician (Caradoc) volcanic rocks of Montgomery, Powys, N. Wales;Dixon;Geological Journal,1988
5. Jones , C. R. 1986 Ordovician (Llandeilo and Caradoc) Beyrichiocope Ostrocoda from England and Wales. Part 1, 1-76, pls. 1-22 Palaeontographical Society (Monograph)