The phrase "a natural formation" is correct and usable in written English.
It can be used to describe a naturally occurring structure or feature in the environment, such as a rock formation, cave, or mountain.
Example: "The Grand Canyon is an impressive example of a natural formation that has been shaped by millions of years of erosion."
Alternatives: "a geological feature" or "a natural structure".
They seem ideally suited to a built-up cityscape that is often compared to a natural formation.
Mount Rushmore is by now such a fixture on the American landscape, such an irresistibly apt expression of our national self-regard, that it is almost easy to understand that Cher thought it was a natural formation until informed otherwise.
Because of his interest in caves, he studied geology as well as archeology, and this is why he could immediately identify Göbekli Tepe as a man-made rather than a natural formation.
Janet Soderberg uses the city skyline as an abstract motif in "Moonrise Over Manhattan," a composite photograph that turns its grid into a crystalline structure that mimics a natural formation, its warm internal glow contrasted with the moon's cool radiance.
Rama's Bridge is now regarded by scientists as a natural formation, built of reef and/or beachrock, that was emergent across the modern ocean gap (Palk Strait) some time before 4500 BP when sea level was lower than today [28].
Scientists are currently divided on the issue with most believing it not a fossil, but a natural formation.
One of her most effective tactics is to associate a set of thoughts and feelings with a specific natural formation, such as the waterfall passage quoted above.
For its existence as an architectural work requires not only its creation by an architect (rather than its coming into existence as a mere natural formation), but also requires the 'reconstructive acts of the viewer' taking up a certain attitude towards the real object and helping co-constitute its aesthetic and even its sensible properties.
There he showed that traffic could be supported by a relatively thin layer of small, single-sized, angular pieces of broken stone placed and compacted on a well-drained natural formation and covered by an impermeable surface of smaller stones.
Accessible via an undulating pier, jutting off from Pingtan's shores, the building emulates an island's natural formation and movement, in Ma's characteristic Shanshui style.
Summing up the typical view, architect and critic Peter Blake wrote in 1960 that Le Corbusier believed a building "should stand in contrast to nature, rather than appear as an outgrowth of some natural formation".
