ナショナルジオグラフィックさんのインスタグラム写真 - (ナショナルジオグラフィックInstagram)「Photo by Stephen Alvarez @salvarezphoto | An engraved boulder in the northern Pahranagat Valley, Nevada: The stylized deer carved into this rock offer a glimpse into the lives of the pre-contact cultures that flourished in this part of Southern Nevada thousands of years ago. Rock art engravings like these are notoriously hard to date. We do know that springs in this area have been used by Native Americans beginning 6,000 years ago. I made this image for my nonprofit @ancientartarchive. We share and preserve humanity’s oldest stories.」6月23日 18時43分