The volcanic rock landform of Xianju National Park was shaped 120 million years ago. With the
Pacific Plate diving beneath the
Eurasia Plate, volcanoes in the coastal area of southeastern China erupted on a large scale. Between two eruptions, there wasn't new lava reaching the crater. Thus, in the weathering process, the crater gradually collapsed into a bowl-shaped pit and then became a lake with more and more water retained in it. After that, volcanoes got active and volcanic rock started to build up again. The volcanic eruptions brought very thick layers of volcanic rock. In the later stage, the
Earth's crust rose and the exposed surface was eroded. With the increase in the erosion degree, the Earth's surface became a combination of various geomorphic types, including scabland, screen-shaped cliffs, door-shaped rock, pillar peaks and so on. In June 1924,
Ren-Chang Ching found longleaf torreya in Xianju. He collected a specimen and took it to the
Arnold Arboretum of
Harvard University in the
United States. In 1925 he named the tree after his academic supervisor,
John George Jack. In March 2014, it began to build a national park and completed in November 2015. ==Geology==