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Relict (Noun)

Geological feature that is a remnant of a pre-existing formation after other parts have disappeared.

Nouns denoting natural objects (not man-made).

The large granite boulder near the park entrance stands as a relict from the last ice age, a testament to the geological forces that once shaped the landscape.
In the desert, the oases are relicts of a wetter era that allowed vegetation and water sources to thrive.
After millions of years of erosion, the isolated hill remained a relict of the original massive mountain range that once dominated the skyline.
Scientists studied the lonely outcropping as a relict from an ancient sea floor, which offered insights into the Earth's distant past.
On the heathland, patches of ancient woodland acted as relicts, preserving the botanical diversity that once spanned the region.

An organism or species surviving as a remnant of an otherwise extinct flora or fauna in an environment much changed from that in which it originated.

Nouns denoting plants.

The coelacanth was long considered a relict of ancient marine life thought to have been extinct with the dinosaurs.
The discovery of the Wollemi pine in 1994 was a significant find, with the species being considered a relict from the time of the dinosaurs.
The goblin shark is a relict species from the Early Cretaceous period, a living fossil that still roams the deep waters of the Atlantic.
In the mountains of Tasmania, a small species of conifer is found, remnants of which also exist as fossils in rocks from the time of the supercontinent Gondwana, a true relict species.
The relict species found in the high-altitude lakes of the Ethiopian Highlands are of particular scientific interest, providing valuable clues to the region's paleoecological history.