Alfred Wallace (1823 - 1913) was a contemporary of Charles Darwin's (1809 - 1882) and had written extensively about evolution, actually having coined the phrase "survival of the fittest." His earlier research agreed with much of which Darwin had been working on.
Interestingly, when Wallace wrote to Darwin regarding his findings, Darwin immediately sought the advice of fellow scientist Charles Lyell (1797-1875) who was a geologist who popularized James Hutton's (1726-1797) theory of uniformitarianism, or that the Earth was subject to very slow but long lasting processes that altered the geology of the planet. (The answer to your true/false is false. Speices evolve slowly like the altering landmasses.)