Some 192 artifacts made of stone, bone, pottery and bronze, unearthed from the Shenna site, are on display at an exhibition at the Xining Museum in Xining City, Northwest China's Qinghai province, June 12, 2019. Shenna is located on the bank of the Beichuan River in Xining, covering an area of approximately 100,000 square meters. It was home to the Qijia culture approximately 4,000 years ago. (Photo: China News Service/ Zhang Tianfu)

Some 192 artifacts made of stone, bone, pottery and bronze, unearthed from the Shenna site, are on display at an exhibition at the Xining Museum in Xining City, Northwest China's Qinghai province, June 12, 2019. Shenna is located on the bank of the Beichuan River in Xining, covering an area of approximately 100,000 square meters. It was home to the Qijia culture approximately 4,000 years ago. (Photo: China News Service/ Zhang Tianfu)

Some 192 artifacts made of stone, bone, pottery and bronze, unearthed from the Shenna site, are on display at an exhibition at the Xining Museum in Xining City, Northwest China's Qinghai province, June 12, 2019. Shenna is located on the bank of the Beichuan River in Xining, covering an area of approximately 100,000 square meters. It was home to the Qijia culture approximately 4,000 years ago. (Photo: China News Service/ Zhang Tianfu)

Some 192 artifacts made of stone, bone, pottery and bronze, unearthed from the Shenna site, are on display at an exhibition at the Xining Museum in Xining City, Northwest China's Qinghai province, June 12, 2019. Shenna is located on the bank of the Beichuan River in Xining, covering an area of approximately 100,000 square meters. It was home to the Qijia culture approximately 4,000 years ago. (Photo: China News Service/ Zhang Tianfu)

Some 192 artifacts made of stone, bone, pottery and bronze, unearthed from the Shenna site, are on display at an exhibition at the Xining Museum in Xining City, Northwest China's Qinghai province, June 12, 2019. Shenna is located on the bank of the Beichuan River in Xining, covering an area of approximately 100,000 square meters. It was home to the Qijia culture approximately 4,000 years ago. (Photo: China News Service/ Zhang Tianfu)

Some 192 artifacts made of stone, bone, pottery and bronze, unearthed from the Shenna site, are on display at an exhibition at the Xining Museum in Xining City, Northwest China's Qinghai province, June 12, 2019. Shenna is located on the bank of the Beichuan River in Xining, covering an area of approximately 100,000 square meters. It was home to the Qijia culture approximately 4,000 years ago. (Photo: China News Service/ Zhang Tianfu)

Some 192 artifacts made of stone, bone, pottery and bronze, unearthed from the Shenna site, are on display at an exhibition at the Xining Museum in Xining City, Northwest China's Qinghai province, June 12, 2019. Shenna is located on the bank of the Beichuan River in Xining, covering an area of approximately 100,000 square meters. It was home to the Qijia culture approximately 4,000 years ago. (Photo: China News Service/ Zhang Tianfu)