Post Researchers investigate 'bright green' wall discovered deep in caves of New Mexico: 'Untouched for 49 million years' – Yahoo February 15, 2026 • Researchers investigate ‘bright green’ wall discovered deep in caves of New Mexico: ‘Untouched for 49 million years’ Yahoo ShareFacebookXLinkedInWhatsAppTelegramPinterestRedditEmailInteractive form removed in AMP view.Interactive form removed in AMP view. View full desktop version