The discoveries of fossils on the beaches of Lyme Regis, England, in the 19th century rocked the world and opened the minds of scientists to the planet's unimaginable age and the extinction of species. Though attributed to men of consequence, the first remarkable finds were made by the poor working-class Anning family—and their young daughter, Mary. Chevalier wraps the history with a tale of the friendship between Mary and Elizabeth Philpot, a gentlewoman also fascinated by the creatures of stone, in a time when women were thought to be ill-suited to the work or incapable of understanding the scope of their finds. Each of these two characters tells a first-person story, and Susan Lyons gives Elizabeth Philpot the diction, reserve, subdued tones, and poise expected of a gentlewoman and shades her with idiosyncrasies, passions, and palpable loneliness. Charlotte Parry is convincing as a callow, coarse Mary Anning, and listeners will witness her gradual maturing and refinement as the story unfolds. The quality audio production enhances Chevalier's picturesque historical novel. A Dutton hardcover (Reviews, Sept. 28). (Jan.)