You are Sukinosaurus

A story about a boy and a girl who spend their youth excavating dinosaurs in their high school's paleontology club. Kaoru Kikumoto, a high school boy who transferred to a school in a country town for some reason, meets a mysterious girl, Kaba Shiraishi, who is looking for fossils on a mountain. Kaba, who is the head of the paleontology club at Kaoru's high school, invites him to join the club.