Which dynasty is The West Chamber and what kind of calligraphy is it?

Chengxian County is known as "the south of the Yangtze River", and the famous cliff stone carving "The West Chamber" in Han Dynasty is located at the foot of Tianjing Mountain in Xia Yuqiao, at 13 km west of the county seat. Xi Xia Fu was carved in Jianning four years ago (A.D. 17 1) and 1835 years ago. Its official name should be Huian Xibiao. Cliff body is engraved with 20 lines and 385 words, which mainly describes the origin, family background and virtue of Li Ming, then the magistrate of Wudu. He did not avoid difficulties and dangers, blocked the process of building the narrow plank road in the west, and praised his achievements in spreading virtue and benefiting the people. It is a precious historical material with high historical and artistic value. The Story of the West Chamber is the product of the extremely mature period of official script, which has made great achievements in calligraphy art and has a long-standing reputation. Except for the words "Huian Xibiao", the others are official scripts. The brushwork is dense and majestic, the calligraphy is imaginary, the brushwork is simple and elegant, the whole tablet body is full of charm, patchwork, simple and elegant style, natural and graceful, and has a broad realistic atmosphere. The Practical Dictionary of Calligraphy and Painting Seal Carving published by Shanghai Calligraphy and Painting Publishing House declared that "the calligraphy has a wide range of arrangement and great momentum, which is rare for Han steles". In the Song Dynasty, Ceng Gong's Nanfengji was the first to write The West Chamber, which attracted the attention and praise of epigraphists and artists of all ages. Fang Shuo, a native of the Qing Dynasty, praised "elegance", Xu Shujun praised "evacuation and elegance, like the wind blowing fairies, floating in the clouds", Kang Youwei praised "sparseness" and Liang Qichao praised "heroic and quiet, and Han Li has a lot". Contemporary scholars evaluate The Romance of the West Chamber as "the first official script in the world" and praise it as "the representative of mountain forest calligraphy style in Han Dynasty". Japanese experts and scholars praised it as "authentic Han Li" and "the highest cliff masterpiece in Han Dynasty".