Sea of time

Constance Clements is an 1880s Montana mine owner-and a time traveler. But she never saw the murder of her husband Rick coming. To get Rick back, the shocked, grief-stricken Con must gain the trust of a Rick from an alternate timeline, who has never met her, and race to the Jurassic Period-where they will have to outwit an enemy who has mastered both time and space...