The phrase "an extraordinary instance of" is correct and usable in written English.
You can use it to describe a remarkable or notable example of something in various contexts, such as literature, science, or personal experiences.
Example: "The discovery of a new species in such a remote area is an extraordinary instance of nature's resilience."
Alternatives: "a remarkable example of" or "an exceptional case of".
Or was this an extraordinary instance of prime ministerial authority and our "elective dictatorship"?
Marci A. Hamilton, a professor at Cardozo Law School who argued before the Supreme Court against the similar earlier law that the justices struck down, said this latest move by the government was an extraordinary instance of federal intrusion into local decision-making.
An even more unusual example is Bitcoin, which evolved its parallel infrastructure (miners and nodes) from scratch straight into Act III, an extraordinary instance of bootstrap levitation.
It was, as I wrote then, an extraordinary instance of a nation totally disowning a long-held official narrative.
John Anstis wrote that: "The Wearing the outward Robes of the Prince, hath been esteemed by the Consent of Nations, to be an extraordinary Instance of Favour and Honour, as in the Precedent of Mordecai, under a king of Persia".
Limiting its consideration of the application solely to the question as to whether this was an extraordinary instance that required disregard of accustomed procedure, the District Court found that this was not a case of peculiar urgency.
This patient was an extraordinary example of a rare tumor.
It was one of the more extraordinary instances of Ma Bell's involvement with Uncle Sam.
It is the combination of mutation and the selection filter that produces the extraordinary instances of adaptation we can document in nature.
But the intensity of their love is documented by Stein's erotic poems (published after her death), by the memoirs of contemporaries, and, in one extraordinary instance, by a piece of literary vandalism.
instance---a fresh instance of class class.
