There are many Sequoia fossils found at the Florissant fossil beds in Florissant, Colorado, including Sequoia affinis.

[2] A trio of Sequoia affinis fossilized stumps—believed to be three basal shoot clones of one original parent tree—has been reconstructed at this site.

The leaves in the fossil species, however, are usually thinner and more delicate.

An example of the leaves of Sequoia affinis has been featured on a postcard in a series on "Tertiary Fossil Plants," issued by the British Museum of Natural History in the early 1920s.

[2] Fossilized Sequoia affinis pollen has been discovered in lake-sediment shale at the site in Florissant, Colorado.