ERS103H5 Lecture Notes - Lecture 2: Geochemistry, Radiometric Dating, Neoproterozoic
Document Summary
Target audience for assignment, non-scientists, convince people to be reading the. Mom dad aunt uncle slight interest in science. Relative dating stenos 3 principles or index fossils. The principle of superposition: sedimentary layers are deposited in a time sequence, with the oldest and bottom and the youngest on top. The principle of original horizontality: layers of sediment are originally deposited horizontally under the action of gravity. The principle of lateral continuity: layers of sediment initially extend laterally in all directions. Super position idea that you need something for your sediments to be deposited on. Lateral continuity idea that since things are horizontal, horizontal basins like oceans, can span kms in distance. Narrow stratigraphic range has to be narrow in terms of time. Is something that allows u to tell geological time. Often live at the top of the ocean. Get transported by ocean currents around the world.
