For professional and amateur palaeontologists alike, Fossils of the Upper Ordovician, edited by David Harper and Alan Owen, is an ideal introduction to identifying the fossils of the Upper Ordovician between 458 and 443 million years ago. Copiously illustrated with photographs and drawings.
David A.T. Harper is a British palaeontologist, specialising in fossil brachiopods and numerical methods in palaeontology. He is Professor of Palaeontology in Earth Sciences, Principal of Van Mildert College, and Deputy Head of Colleges in Durham University. Alan W. Owen is the editor of The Palaeontological Association Field Guide to Fossils, Number 7, Fossils of the Upper Ordovician, published by Wiley.