Principle of lateral continuity

As a result, rocks that are otherwise similar, but are now separated by a valley or other erosional feature, can be assumed to be originally continuous.

Layers of sediment do not extend indefinitely; rather, the limits can be recognized and are controlled by the amount and type of sediment available and the size and shape of the sedimentary basin.

As long as sediment is transported to an area, it will eventually be deposited.

The lateral variation in sediment within a stratum is known as sedimentary facies.

In those cases, the lateral limits of the sedimentary layer will be marked by an abrupt change in rock type.

Schematic representation of the principle of lateral continuity. [ 1 ]
The Permian through Jurassic strata of the Colorado Plateau area of southeastern Utah that makes up much of the famous prominent rock formations in widely spaced protected areas such as Capitol Reef National Park and Canyonlands National Park . From top to bottom: Rounded tan domes of the Navajo Sandstone , layered red Kayenta Formation , cliff-forming, vertically-jointed, red Wingate Sandstone , slope-forming, purplish Chinle Formation , layered, lighter-red Moenkopi Formation , and white, layered Cutler Formation sandstone. Picture from Glen Canyon National Recreation Area , Utah.