Permo-Triassic

The Permian is identified in the novel’s glossary as the final period of the Paleozoic Era and a transition toward the Mesozoic. Dated to approximately 290–255 million years ago, it is associated with the development of amphibians and the first reptiles, placing the story’s reflections on life and deep time within a specific geological frame.

Geological Definition

The glossary defines the Permian by both its position and its biological significance: it closes the primary, or Paleozoic, era and marks a passage toward the secondary, or Mesozoic, era. The entry gives its approximate span as 290–255 million years ago, making the period a bounded interval in the book’s much larger account of Earth’s history.

Life and Transition

The Permian entry singles out two developments: amphibians flourished, and the first reptiles began to exist. This compact description presents the period as a threshold in vertebrate history, linking earlier forms of animal life with the appearance of reptiles. Its transitional status is therefore both geological and biological.

Place in the Book’s Timescale

The Permian occurs as a reference point in the glossary rather than as a narrated episode. Its compressed definition contrasts with the novel’s expansive treatment of evolution and ecological change: a geological age lasting tens of millions of years is reduced to a few lines, yet those lines connect the history of life to the book’s recurring concern with immense spans of time and the transformations they contain.