The Best Exposure Of Rocks - 992 Words

The best exposure to of rocks can be seen in road cuts, because they the great variety in the rock types and formations within the area. Stray fragments of rocks can be found in mass quantity alongside the river, held back from the road by barriers, or as a cut face that is parallel to the road. You can clearly see the different intrusions along the roadside, dikes running along crevices, and many instances of solid rock blasted in order to clear a way for the road. These mass capacities of the same rock are plutons that have been uplifted over geologic time1. Tonalitic plutons consisting of primarily granodiorite and quartz are all over the Cascade Range, forming the Grotto/Index (~25m.y.) and Snoqualmie (~18m.y.) Batholiths of common rock types. More recent Swauk sedimentary structures are seen as overlap from the nearby Blewitt (formerly Swauk) Pass region, likely formed as result of the last ice age1,2,5. These sedimentary layers fade out deeper into the mountains, as the igneous intrusions become more predominant within the range. White and black-grained diorite is common and clearly identifiable as well as amphibolite if looking around the Wenatchee or Skykomish River where it has been broken, carried, and eroded to land on its banks (figure 5). Biotite schist, hornblende, and quartz intrusions are not uncommon, seeing a new kind of whether solid or with distinct dike intrusions at each roadcut.5 Location specific granites have been mined as well as gold and silverShow MoreRelatedCompetition With Other Organisms : A Biotic Factor That Influences The Distribution Of The Chitons On Rocks1452 Words   |  6 PagesCompetition with other organisms increases down the shore, and is a biotic factor that influences where the snakeskin chiton are distributed. The main reason for competition between organisms, is living space on rocks. 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