1997

Underwood, Charlie J. and Crowley, S.F. and Marshall, J.D. and Brenchley, P.J. (1997) High resolution carbon isotope stratigraphy of the basal Silurian stratotype (Dob's Linn, Scotland) and its global correlation. Journal of the Geological Society 154 (4), pp. 709-718. ISSN 0016-7649.

2001

Brenchley, P.J. and Marshall, J.D. and Underwood, Charlie J. (2001) Do all mass extinctions represent an ecological crisis? evidence from the late Ordovician. Geological Journal 36 (3-4), pp. 329-340. ISSN 0072-1050.

2006

Brenchley, P.J. and Marshall, J.D. and Harper, D.A.T. and Buttler, C.J. and Underwood, Charlie J. (2006) A late Ordovician (Hirnantian) karstic surface in a submarine channel, recording glacio-eustatic sea-level changes: Meifod, central Wales. Geological Journal 41 (1), pp. 1-22. ISSN 0072-1050.