COMMENTS ON G. K. GILBERT'S 1877 REPORT ON THE GEOLOGY OF THE HENRY MOUNTAINS

This report documents the workings of a remarkable geologic mind. This work is Gilbert's first substantial publication receiving wide recognition. References to this work, from reviewers of the time to all later commentaries on Gilbert, laud his directness of approach, simple but powerful reasoning, and clarity of exposition. The Report is a perfect illustration of the qualities that made Gilbert famous. What follows is the impression this work has had on a much later geologist. it further prompts a comparison with how Gilbert's record and style would be viewed in today's world.

Gilbert was clearly captivated by his earlier view of the Henry Mountains. Thus, curiosity brought him back for a study. Can we now tolerate whimsy such as "Ways and Means" in a serious report? That alone brought me to Gilbert. He approached the field in the same way we want students to interact with the Earth: to see the landscape with eyes that expect a rational explanation. Discussion of structure, stratigraphy, rock type, topography all were analyzed from basic science. His research was efficient in deciding key areas to spend time. While he freely discussed work, the ideas as finally presented were his own. He took note but also had a very good memory to be able to generate the Report. He showed breadth and depth of insight with a confidence in his reasoning. In today's world, Gilbert's style would not quite fit for several reasons.