Definitely not as romantic as a message in a bottle but shows the importance of keeping records and communicating. It is actually quite awesome since it does provide some information about the past and its conditions. It would also be a good material for a movie like an old school reddit theme movie.
But please don’t leave anymore message on rocks. You may be arrested. Utah and California are already struggling with rock vandalism in national parks. These days if you have something to say please use the web, it is more efficient.