I absolutely adored 'Remarkable Creatures' by Tracy Chevalier—it’s one of those historical novels that sticks with you. From what I’ve gathered, there isn’t a direct sequel, but Chevalier has written other books with a similar vibe, like 'The Lady and the Unicorn' or 'Burning Bright.' If you loved the fossil-hunting theme, you might enjoy 'The Fossil Hunter' by Shelley Emling, which delves deeper into Mary Anning’s real-life story.
Personally, I’d kill for a follow-up that explores what happens to Elizabeth Philpot after the events of the book, but for now, we’ll have to settle for rereading and imagining her next adventures. Maybe one day Chevalier will surprise us!