http://www.bahiker.com/
castlerock.html
http://www.edu.pe.ca/
southernkings/sedimentary
ec.htm
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Ji, Mary 8East, Fieldwork Analysis | |||||||||||||||||||||||||||||||||||||||||||||
| 1000 to 1200 million years ago | |||||||||||||||||||||||||||||||||||||||||||||
| 445 million years ago | 560 million years ago | ||||||||||||||||||||||||||||||||||||||||||||
| 380 million years ago | |||||||||||||||||||||||||||||||||||||||||||||
| 200 million years ago | |||||||||||||||||||||||||||||||||||||||||||||
| Present Day | |||||||||||||||||||||||||||||||||||||||||||||
|
|
|||||||||||||||||||||||||||||||||||||||||||||
| Pleistocene's rock unit is glacial detitus. The orginial rocks or sediments are till, sands, and clay where the conential glaciations, leaving moraines and outwash plains. | |||||||||||||||||||||||||||||||||||||||||||||
| 200 million years ago was the Jurassic and Triassic period, which had original rocks or sediments such as red sands, shale's, and conglomerates. The geological event rift basin formation and basaltic volcanism related to extension; eventually opening of the Atlantic Ocean, 110 million years of erosion. | |||||||||||||||||||||||||||||||||||||||||||||
| 380 million years ago was the devonian period. Acadian orogeny expressed by intrusion of any small two-mica tourmaline granites, shearing, and retrogressive metamorphism, which produced muscovite and shist and termolite marble uplifted an erosion. | |||||||||||||||||||||||||||||||||||||||||||||
| Around 445 million years ago was the Ordovician period. It is anatectic granites, where there is upright foldig and intrusion of granites, metamorphic at peak. | Around 560 million years ago, the Ned Mountain formed by igneous activity record lithosphere extension, which helped promote the birth of Lapetus Ocean. Yonker gneiss member, Ned Mountain fm. to deeper water (manhattan schist) | ||||||||||||||||||||||||||||||||||||||||||||
| Around 1000 to 1200 million years ago, it was the middle Proterozonic period, which formed the fordham gneiss. It was related to volcanic and plutonic rocks with minor sediments. Grevillian orogeny was metamorphism, granite intrusion, deformation; Volcano activities. | |||||||||||||||||||||||||||||||||||||||||||||
| This timeline shows different millions of years and shows you how it changed as time went by, such as the volcano activities to the glaciations of the rocks. In Central Park I can tell that there might have been a volcano because since there were igneous rocks, and igneous rocks are made out of lava, there must have been a volcano before. This observation gives me two perspectives on what Central Park used to be a volcano, or an ocean. I think that it used to be a volcano because there are igneous rocks, which were made of lava or magma. I think that it used to be an ocean because of the glaciers. Glaciers must have covered this region. This is because ice covered much of North America. In Central Park, I observed that there are many types of crystal sizes in the rocks. From the earth science book, it states that the water from melting forms the glaciers. When the rocks form deep in the earth, the crystals grow faster, and when the rocks form closer to the surface, the crystals get smaller. When the rocks have many different colors, it will tell you that, that rock contains many kinds of minerals. | |||||||||||||||||||||||||||||||||||||||||||||
| By knowing if a rock is soft, or hard, this can tell you about the types of minerals used to form the rock. Many types of rocks have different kinds of foliation, so this can tell you if the rock was formed through metamorphosis, which means that it was changed by heat or pressure. By looking at the textures of the rocks you find in Central Park, it will tell you if the rock were exposed to any kind of weathering. | |||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||
| From the reference table, it tells you that there are different kinds of foliation in the schist because it is a medium-grade metamorphism. Different rocks form by different kinds of weathering, and how where they are located. Some rocks are located in colder or sunnier places, so that will affect the outcome of the rock. | |||||||||||||||||||||||||||||||||||||||||||||
| The types of evidence we saw in Central Park is that marine are big cracks caused by sediment carried by glacier cut into the rocks. Erratic are big boulders caused by erratic carried by a glacier. From the evidence that I collected, I can tell that the rocks are older than the glaciers, and the glaciers must have covered this region. Glaciating happens when the snow falls faster than it does melts, and the constant gradual increase, it will accumulate more snow. Snow accumulates from top to bottom on land and the glaciers flow downhill. In the zone of sublimation evaporation because when the snow melts it evaporates. The most pressure is going to be on the bottom, it will be more packed. At the bottom it is a super cold. | |||||||||||||||||||||||||||||||||||||||||||||
| This rock has been weathered down and now have a trail. http://www.bahiker.com/ castlerock.html |
|||||||||||||||||||||||||||||||||||||||||||||
| I think the land we call New York was once an ocean because sediments of clay got deposited into the ocean. After time, the ocean turned into shale (a sedimentary rock). Shale got pushed deep in Earth. The results of two plates colliding caused a lot of heat and pressure. Rock got metamorphosed and the ground got uplifted and folded. The glaciers on the land got weathered away. And thus, forming New York. New York is mostly glaciers on the land got weathered away. And thus, forming New York. New York is mostly made up of the rock, schist, and metamorphic rock contains minerals such as chlorite, mica, quartz, feldspar, amphibole, garnet, and pyroxene. So I think that New York was once an ocean. | |||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||
| There are many kinds of minerals and all minerals are a naturally occurring, inorganic solid that has a crystal structure and a definite chemical composition. There are minerals such as naturally occurring minerals, inorganic minerals, solid, crystal structure and definite chemical composition. Naturally occurring minerals can be classified as a substance that much occur naturally. Inorganic minerals can be classified as minerals that cannot arise form materials that were once part of a living thing. Solid minerals are minerals that are always a solid, with a definite volume and shape. Crystal structure is minerals that are lined up in a pattern that repeats over and over again. Definite chemical composition is a mineral that has a definite chemical composition. This means that the mineral always contain elements in definite proportions. | |||||||||||||||||||||||||||||||||||||||||||||
| This is a sedimentary rock that the weather broke the rocks into smaller pieces. http://www.edu.pe.ca/ southernkings/sedimentary ec.htm |
|||||||||||||||||||||||||||||||||||||||||||||
| bibliography | |||||||||||||||||||||||||||||||||||||||||||||
| Back to Science | |||||||||||||||||||||||||||||||||||||||||||||