【摘要】 本文详细描述了在河北省怀来县境内长城系团山子组猪肝色白云岩内发现的潜穴和生物扰动构造,潜穴个体较小,最大者长5～7mm,d=2～3.5mm,最小者长2mm,d=0.08mm,形态多样,为短直管状、锥状、罐状、长管状。该发现为动物出现时间的大大超前(时限约在1700～1757Ma之间)提供了确凿证据。更多还原

【Abstract】 A large mount of burrows and bioturbation structures are found in the thin sections of brown dolomite in the Tuanshanzi Formation of Changcheng System, Huailai County, Hebei Province. The bodies of the burrows are small. The maximum length is 5~7mm , d = 2~ 3. 5mm , the minimum length is 2 mm , d = 0. 08mm. The forms are short tubular, conical, earthenware jar or long tubular. The discovery of burrows provides conclusive evidence for the precedence of time of the animal occurrence (about 1 700~1 757Ma).更多还原