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    Sedimentary Rocks

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    Sedimentary Rocks Sedimentary rocks are formed from layers of deposits laid down in lakes or seas. Over millions of years the layers of sediment build up resulting in the weight pressing downwards, creating high pressure, which squeezes the water out. As the water is squeezed out, salts form between the particles of sediment due to crystallization and this cements the particles together. Sedimentary rocks can either rise to the surface again to be discovered, or they can descend into the

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    Sedimentary Rock Formation

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    In their page, Rocks or Idaho; Harvey, Jacqueline, Vita Taube, and Diana Boyackarth states that the earth contains three types of rocks: igneous, metamorphic, and sedimentary rocks. Sedimentary rock makes up most of the rocks on the earth.The earth contains seventy five percent sedimentary rock. Seventy percent are sedimentary rocks that are on the earths surface, the other 5% is on the earths crust. Sedimentary rocks are formed in two main stages. First ocean waves, rivers, glaciers, wind or landslides

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    Type of Rock The rock coquina is originally a sedimentary rock. Sedimentary rocks are made up of sediments. The sediments are formed by the mechanical or chemical activities of the natural activities like running water, blowing wind, glaciers etc. this which causes disintegration and decomposition of the pre-existing rocks. The products of decay are transported to some depositional sites by the natural agencies, where they get deposited and with subsequent compaction form sedimentary rocks (Hefferan

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    Sedimentary rocks are the rocks formed from compaction and cementation of fragments of pre-existing rocks called crystals. Exogenic processes such as weathering and erosion influence the formation of sedimentary rocks. This processes supply the materials (sediments), responsible for the formation of sedimentary rocks. Weathered materials are transported by the agents of denudation such as water, wind and ice; then are deposited in low altitude areas. The accumulated materials are compacted as results

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    the Starved Rocks, Illinois Describe the clastic and carbonate facies you have discovered. Starved Rock State covers about 200 miles and some 470 million years, from Ordovician sandstones to Pleistocene glacial till. The Ordovician St. Peter Formation sandstone was deposited across the midcontinent during the second major marine transgression of the Paleozoic Era. The first transgression deposited Upper Cambrian to Lower Ordovician clastics and carbonates. The clastic to carbonate rock transition

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    measure of how much of a rock is open space. It also is a measure of its ability to hold a fuild. The porosity can be between grains or within cracks, or cavities of the rock. Permeability is a measure of the ease of flow of a fluid through a porous solid. A rock may be extremely porous, but if the pores are not connected, it will have no permeability. Likewise, a rock may have a few continuous cracks which allow ease of fluid flow, but when porosity is calculated, the rock doesn't seem very porous

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    Concretions

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    hard compact accumulations of mineral matter and are found inside sedimentary rocks. Some examples of this are Sandstone and in some weathered volcanic rock. Concretions come in many different shapes and the most common of the shapes is spherical or disk shaped. Concretions are the most varied-shaped rocks of the sedimentary world. The way concretions come to be is the mineral matter concentrates around the nucleus of a host rock. The nucleus is often organic such as a tooth or leaf or shell or fossil

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    ROCKS

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    Introduction to Sedimentary rocks Sedimentary rocks have been around for millions of years. They are what has shaped this earth and what have made it our home. Sedimentary rocks are made up of the accumulation of sediments. They are formed through a five step cycle known as the rock cycle. Through this cycle the rocks are formed and altered from being sediments to becoming sedimentary rocks. In this process the first step is weathering. Weathering is the process of transforming solid rock into smaller

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    Relative Dating

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    field by geologists' and earth scientists to gather information about the relative age of rock bodies and other cool geologic stuff. These principles are the principle of superposition, the principle of original horizontality, the principle of cross-cutting relationships, and the principle of inclusions.The principle of superposition is defined as in the environment of an undisturbed layer of sedimentary rocks; the layers on the bottom are older than the layers towards the top. The pictures I have

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    Copper and Molybdenum Deposits in the United States Copper and molybdenum resources were not recognized as valuable commodities until economic needs demanded the collection and processing of these minerals in large amounts. The most expansive deposits of copper and molybdenum occur in massive low grade ores and are found in intrusive porphyry formations, although many smaller sized but higher grade ores are located in non-porphyry areas. The nation has abundant domestic copper ore reserves but

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