Photo taken on April 8, 2019 shows numbered fossils from the Qingjiang biota in Northwest University in Xi'an, capital of northwest China's Shaanxi Province. [Photo: Xinhua/Liu Xiao]" A student from the Department of Geology carries out research on a fossil from the Qingjiang biota in Northwest University in Xi'an, capital of northwest China's Shaanxi Province, April 8, 2019. [Photo: Xinhua/Liu Xiao]" An undated photo shows a fossil of Leanchoilia arthropod from the Qingjiang biota. [Photo: Xinhua/Northwest University]" An undated photo shows a fossil of new species from the Qingjiang biota. [Photo: Xinhua/Northwest University]" An undated photo shows a fossil of branched alga from the Qingjiang biota. [Photo: Xinhua/Northwest University]" |