Petro-2 Ian PalmerJan 19, 2021Jan 10, 2024 700 year old Petroglyphs in sandstone Discover more from Ian Dexter Palmer Ph.D Subscribe to get the latest posts sent to your email. Subscribe <span class="nav-subtitle screen-reader-text">Page</span> Previous PostHiking and petroglyphs and The Shale Controversy. CommentCancel reply This site uses Akismet to reduce spam. Learn how your comment data is processed. We use cookies to improve your experience on our website Accept Decline