What type of informational text is James Cross Giblin's "The Riddle of the Rosetta Stone?"

The answer is: Literary Nonfiction.

"The Ridle of the Rosetta Stone," by James Cross Giblin, fits in the category of litery nonfiction because it contains narrative text with factual information, and it is read from beginning to end.

Other types of informational texts are Expository Texts, which consist of charts and tables of contents so that readers can look up the information they need without reading the whole book. Argument or Persuasion Texts intend to influence the readers' actions or thoughts. Meanwhile, Procedural Texts provide instructions on how to complete a task.

Literary Nonfiction.