The phrase "fossil record" refers to the collection of remains or traces of ancient life found in rocks. It helps scientists understand past organisms, their characteristics, and how they evolved over time. Full definition
We have extensive fossil records of humans over millions of years. (religion.blogs.cnn.com)
Based on their findings from fossil records, researchers say the emergence of birds some 150 million years ago was a gradual process, as some dinosaurs became more bird - like over time. (sciencedaily.com)