I managed to get as far as starting to uncover my first fossil in Montana, but then the game froze. Not sure if my laptop is just too warm or whether I should re-launch from the Itch app. Stupid hot weather. But I've been fine playing other games. Anyway, I've wishlisted on Steam. I'll try again, since it looks like my kind of game, and I do want to play it. I'll play it when it comes on Steam anyway.
I did re-launch, and hadn't saved, so started from the beginning. Tried Saskatchewan instead this timed, and found my seventh fossil just before the game froze again. Sigh. Wish the game auto-saved. I did find another fossil, but it was partly in the green stuff and I couldn't get the whole fossil uncovered. Ah well.