Taihang Mountains

As early as the Northern Song Dynasty, there were people who proposed analytical opinions on the formation history of the Taihang Mountains, one of whom was the scientist Shen Kuo. At that time, he was in the Taihang Mountains and saw 'faint traces of snail shells and stones like bird eggs, stretching across the stone walls like a belt.' He began to analyze this in depth and, after research, pointed out that 'this was once a seaside, now nearly a thousand miles east of the sea.'