Most of the land surface of the earth is formed by valley slopes. At a given point on the ground surface it is normally possible to follow the line of maximum slope downwards until a drainage channel is reached; moreover a causal relation between the slope and the channel is apparent. This feature has been little remarked upon, possibly because it is so widespread as to seem part of the natural order. It is nevertheless a fundamental and remarkable feature of the earth’s surface form. <...>

This SME Guide for Reporting Exploration Information, Mineral Resources, and Mineral Reserves (the SME Guide) has been adopted by the Society for Mining, Metallurgy, and Exploration, Inc. (SME) for use by members of this organization and others. A history of the Guide is provided in Appendix H.

My adventures as a paleontologist have taken me to many exciting places at home, in the UK, and abroad, and led to the discovery of new species. Working with teams of colleagues, I named the new dinosaurs Eotyrannus, Xenoposeidon, Mirischia, and Vectaerovenator, and the pterosaurs Vectidraco and Eurazhdarcho. One of the things that interests me most about dinosaurs, giant marine reptiles, and other ancient animals is that every one of them has a unique history, just as animals do today. <...>