My recent and current research has primarily concentrated on the application of palaeontological, geochemical and field data to detailed stratigraphic and palaeoenvironmental studies. This has focussed on several main areas:
(1) Evolution and palaeoecology of sharks and rays
Stratigraphic and environmental significance of hiatal and transported bone-beds
Taxonomy and evolution of Mesozoic sharks and rays and the evolution of selachian-dominated ecosystems
Development of 'modern type' shark and ray ecosystems in the Cretaceous and Palaeogene
Shark and ray ecology associated with whale carcasses
Documentation of the diverse shark and ray assemblages of the Wadi Al-Hitan World Heritage Site, Egypt
Use of Mesozoic sharks in the analysis of palaeosalinity changes and as indicators of marine nutrient flow and temporal evolution of watermasses
(2) 'Mid'- Cretaceous stratigraphy
Micro- and macrofossil biostratigraphy and lithostratigraphy of the Cretaceous of NE England
Composite sequence- and biostratigraphical analysis of 'mid' Cretaceous onlap patterns
(3) Palaeoecology of graptolitic assemblages
Biostratigraphy and palaeoecology of Ordovician and Silurian planktic assemblages
Environmental changes and their chemostratigraphic and ecostratigraphic signatures within the Ordovician and Silurian