![]() 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. It shows what the surface of the Earth above these rocks looks like, as though we were looking down from space. 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. ![]() We do not specify which types of rocks form the layers in these cartoon diagrams. In a real cross section or geologic map, each layer is color coded to be a specific type of rock. Principle that states that undisturbed sequence of sedimentary strata, the oldest rock layer will be at the bottom and the youngest will be at the top. 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. 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. Question2: Are the rock layers in the Figure 1 flat Yes or No (hint: for reference, compare with the rocks in the lower part of. ![]() This law states that, for sedimentary rock layers, these layers were originally deposited horizontal, or flat. Stratigraphy is the study of layered sedimentary rocks. Question 1: Which sedimentary rock layer is the oldest Law 2: Law of Original Horizontality. 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
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