Remains of 4,000-year-old lost city in China discovered

Researchers have discovered a 4000-year-old lost city named Shamal on a ridge above China's Two Way River. The city flourished from 2300 BC to 1800 BC, covering an area of 988 acres. A massive step pyramid, at least 230 feet high and stretching 59 acres at its base, was found. The pyramid, built from a hill with eleven steps, was protected by inner and outer walls. Atop the pyramid were palaces made of rammed earth, wooden pillars, and roofing tiles, along with a large water reservoir and domestic remains. The findings were published in the Journal Antiquity.

What materials were used in the construction of the palaces atop the pyramid?

What types of remains were found that relate to daily life in the city?