Babcock, L. E., M. D. Wegweiser, A. E. Wegweiser, S. C. McKenzie, and A. Ostrander 1998 Marginal-marine lithofacies, biofacies and ichnofacies, Chadakoin and Venango formations (Upper Devonian), Union City Dam, Erie County, Pennsylvania. Pages 26-32 in J. Harper, editor. 63rd Annual Field Conference of Pennsylvania Geologists: Geotectonic Environment of the Lake Erie Crustal Block. Field Conference of Pennsylvania Geologists, Harrisburg, PA.
Anderson, L. I. 1994 Xiphosurans from the Westphalian D of the Radstock Basin, Somerset Coalfield, the South Wales Coalfield and Mazon Creek, Illinois. Proceedings of the Geologists' Association 105:2650275.
Anderson, L. I. 1997 The xiphosuran Liomesaspis from the Montceau-les-Mines Konservat-Lagerstatte, Massif Central, France. N. Jb. Geol. Palaont. Abh. 204:415-436.
Pickett, J. 1993 A late Devonian xiphosuran from near Parkes, New South Wales. Mem. Ass. Australas. Palaeontols 15:279-287.
Dunlop, J. A. 1998 The origins of tetrapulmonate book lungs and their significance for chelicerate phylogeny. Pages 9-16 in Proceedings of the European Colloquium of Arachnology, Edinburgh. P.A. Selden (ed.)