East is to the right, south is at the bottom, and west is to the left. The “N” arrow indicates the North direction on this diagram. An undeformed sequence of sedimentary rocks is exposed in a large rive canyon. It shows what the surface of the Earth above these rocks looks like, as though we were looking down from space. Which of the following describes the principle of original horizontality Folded sedimentary layers were originally laid down flat and later deformed. You can rotate this view in the 3D model to better see the arrow.įigure 1B is the map view of the block diagram from Figure 1A. The principle is important to the analysis of folded and tilted strata. We do not specify which types of rocks form the layers in these cartoon diagrams. What is the principle of original horizontality The Principle of Original Horizontality states that layers of sediment are originally deposited horizontally under the action of gravity. In a real cross section or geologic map, each layer is color coded to be a specific type of rock. The different colors represent layers or beds of different types of rock. The Safari browser is NOT compatible with the 3D models.įigure 1A is a block diagram of horizontal layers or strata. To view block diagrams, you will need to use a compatible brower. For the first time, Nobel Prize Outreach and the European Research Council. The Principle of Original Horizontality states: Layers of rocks deposited from above, such as sediments and lava flows, are originally laid down horizontally. The Principle of Superposition states : In an otherwise undisturbed sequence of sedimentary strata, or rock layers, the layers on the bottom are the oldest and layers above them are younger. Stratigraphy is the study of layered sedimentary rocks. In order to understand the structural diagrams we will use in this module, it is necessary to remember two principles of stratigraphy. 26 Original Horizontality and Superposition I graduate from high school - June, 1988 Although your 'relative' list should be in exactly the same order as mine, the 'age' of the events will not be the same.
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