… The bus veered south into
A land of lunar ventifacts and umbrella pines
… Rainstorms still pursued us.
Horizons turned to a calamitous black,
And the streets of obscure towns steamed
In the sun …
— John Ash
definiton: A faceted stone shaped or altered by wind-blown sand.
from the Oxford English Dictionary, which quotes J. W. Evans, “for any wind-shaped stone, we might speak of a ‘ventifact’, on the analogy of artifact.”
One might note the oddity of a wind-shaped stone being called "lunar" what with there being no wind on the moon.
source: “Stations,” a poem in In the Wake of the Day by John Ash