https://phys.org/news/2018-07-discovery-ancient-tools-china-humans.html

The artefacts include a notch, scrapers, cobble, hammer stones and pointed pieces. All show signs of use—the stone had been intentionally flaked. Most were made of quartzite and quartz that probably came from the foothills of the Qinling Mountains 5 to 10 km to the south of the site, and the streams flowing from them. Fragments of animal bones 2.12 million years old were also found.

The Chinese Loess Plateau covers about 270,000 square kilometres, and during the past 2.6m years between 100 and 300m of wind-blown dust—known as loess—has been deposited in the area.