see also
Amazon review (click)
quote:
Charles Lyell was a pioneering 19th-century geologist, and Charles Darwin's mentor. During his travels throughout America, he looked for evidence to confirm his theory of the uniformity of geological history, and made insightful observations about American society and the continent's regional differences. This study blends detailed scientific observations with colorful travelogue to chronicle his travels, and draws on previously unpublished letters and journals as well as Lyell's published writings. Includes b&w illustrations. Book News, Inc., Portland, OR
Without Lyell's time frame Darwin would have had more difficulty with his theories. (Note to C'ists ... it's all Lyells fault ... )