ERS120H5 Lecture 18: LEC #18 (Geologic Time and Rock Dating Methods)
13 Mar 2017
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Lecture #18 geologic time and rock dating methods. In order of creation (think of the principle of superpositioning, but remember it is not always present): erosion, basalt i, basalt ii, conglomerate, breccia, erosion, tilting, limestone, shale, sandstone, erosion, gneiss. The principle of unconformities: an unconformity is a rock interface which represents a gap. If you have the rocks meeting at an angle, with sedimentary rocks below and above, it is referred to as angular unconformity. If there are igneous rocks below and sedimentary rocks above, it is called a. If there are flat sedimentary rocks above and below, with the rocks below depositing a soil above, it is called a disconformity. The principle of original horizontality: sedimentary layers (and lava flows) are usually originally laid down horizontally. If they are not now horizontal, they have been deformed. Fossil succession: each species has a limited range in a succession of strata.
