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<blockquote data-quote="inyati13" data-source="post: 1197222" data-attributes="member: 17767"><p>Craig, my undergraduate minor was geology. The study of the layers of rocks is the science of Stratigraphy. Rocks are formed from deposits in mainly marine environments. For example, sand is deposited in the near shore marine environment and the forces generated by weight compact the sand into sandstone units. Limestone is deposited as lime falls out of solution and accumulates on the ocean floor. As geologic time passes the deposits are lifted by subsurface movements and the rocks are exposed in terrestrial environments. Sometimes aggressive subsurface activities completely over-turn these stratigraphic units such that the youngest layers are actually on the bottom. This confounded geologist for many years until it was fully recognized that units can be over-turned.</p><p></p><p>All rocks take millions and millions of years to form. Depositional environments are complex. Near shore marine environments that are influenced by major river discharges have increased depositional rates but it is easy to understand that no rock layers can be formed in nothing less that geologic time units.</p><p></p><p>In regard to your specific question, stratigraphic units are being deposited all over the world as I write this. The deposits in the Atlantic Ocean are being deposited at the same time that it is occurring in the Pacific Ocean. Could you elaborate on your question? By the way, plate tectonics is not the primary factor in depositional events but does play a major role in the lifting of the deposits after they have been cemented or formed into layers of rock. One addition point, there are three major categories of rock: sedimentary, igneous, and metamorphic. In regard to igneous and metamorphic rock, heat becomes a major factor in the formation of lithologic units.</p></blockquote><p></p>
[QUOTE="inyati13, post: 1197222, member: 17767"] Craig, my undergraduate minor was geology. The study of the layers of rocks is the science of Stratigraphy. Rocks are formed from deposits in mainly marine environments. For example, sand is deposited in the near shore marine environment and the forces generated by weight compact the sand into sandstone units. Limestone is deposited as lime falls out of solution and accumulates on the ocean floor. As geologic time passes the deposits are lifted by subsurface movements and the rocks are exposed in terrestrial environments. Sometimes aggressive subsurface activities completely over-turn these stratigraphic units such that the youngest layers are actually on the bottom. This confounded geologist for many years until it was fully recognized that units can be over-turned. All rocks take millions and millions of years to form. Depositional environments are complex. Near shore marine environments that are influenced by major river discharges have increased depositional rates but it is easy to understand that no rock layers can be formed in nothing less that geologic time units. In regard to your specific question, stratigraphic units are being deposited all over the world as I write this. The deposits in the Atlantic Ocean are being deposited at the same time that it is occurring in the Pacific Ocean. Could you elaborate on your question? By the way, plate tectonics is not the primary factor in depositional events but does play a major role in the lifting of the deposits after they have been cemented or formed into layers of rock. One addition point, there are three major categories of rock: sedimentary, igneous, and metamorphic. In regard to igneous and metamorphic rock, heat becomes a major factor in the formation of lithologic units. [/QUOTE]
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