The ethnic groups in North China gradually invented a kind of phenology calendar that shows year and season by natural phenomena in the process of fishing and hunting to guide production and life.
北方民族在长期的渔猎生产中逐渐形成了以物候确定年岁、节的自然物候历，用以指导人们的生产与生活。
3
A discussion on metallogenic model, exploration guide and ore hunting indicator is given.