Here's why:
* Contemporary Literature: Riordan's works are considered contemporary literature, meaning they are written and published in the present time.
* Genre: His writing falls primarily within the genres of fantasy, adventure, and young adult fiction. These genres are not typically associated with specific literary eras.
* Style: Riordan's style blends elements of traditional fantasy with modern storytelling techniques, making it hard to pin down to a specific era.
Therefore, while Riordan's work shares certain characteristics with earlier eras (like the classic Greek myths he reimagines), it is ultimately considered contemporary.