地层叠覆律:原始地层自下而上是从老到新的(上新下老) 原始水平律:地层沉积时是近于水平的,而且所有的地层都是平 行于这个水平面的(水平摆放 原始侧向连续律:地层在大区域甚至全球范围内是连续的,或者 延伸到一定的距离逐渐尖灭(侧向连续)。 地层学三定律是构造地质学和地层学的基础 Principle of superposition n any sequence of undisturbed strata (rock layers), the oldest layer is on the bottom and the youngest is on the top. inciple of Original Horizontality Sediments settle from fluids under the influence of gravity, therefore the deposits are nearly horizontal or at very shallow inclines Principle of lateral continuity water-laid stratum, at the time it was formed, must continue laterally in all directions until it thins out as the result of nondeposition or until it abuts against the edge of the original basin of deposition 相邻地层学三定律是构造地质学和地层学的基础 地层叠覆律:原始地层自下而上是从老到新的(上新下老) 原始水平律: 地层沉积时是近于水平的，而且所有的地层都是平 行于这个水平面的(水平摆放). 原始侧向连续律: 地层在大区域甚至全球范围内是连续的，或者 延伸到一定的距离逐渐尖灭(侧向连续)。 Principle of Superposition In any sequence of undisturbed strata (rock layers), the oldest layer is on the bottom and the youngest is on the top. Principle of Original Horizontality Sediments settle from fluids under the influence of gravity, therefore the deposits are nearly horizontal or at very shallow inclines. Principle of Lateral Continuity A water-laid stratum, at the time it was formed, must continue laterally in all directions until it thins out as the result of nondeposition or until it abuts against the edge of the original basin of deposition. 相邻