The Saint Peter area has a variety if geology structures within it. At the first stop we made, there was Ordovician dolomite, Cambrian sandstone, and Quaternary till. The sandstone was the oldest in the formation of rocks dating back over 550 million years. It was a layered set of sandstone and was folded. The elevation was less than 1,000 feet and its thickness was approximately 115. The next oldest in this area was the Ordovician dolomite. This is roughly 505 million years old. It was bedded flat and had layers. Its elevation was also less than 1,000 and the thickness was approximately 20. The newest rock in the area was the quaternary till that was on the top. This could have been deposited in the last million years. The sand sediments found
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This could have been an extended formation from the first stop because they have similar substances but this does not necessarily mean they are the same. We continued off the map of Saint Peter to the cliff between the flood plain and Kasota Prairie and found cambrian sandstone and ordovician dolomite. These rocks were bedded and had an obvious distinction line between the two units. At the Kasota quarries in the south of Kasota there is a large amount of ordovician dolomite. In this area, there was a large amount of dolomite and it was used for construction, used as tile, and stone for buildings. In the gravel pits south of Kasota there is a large amount of quaternary sand and gravel that has sand pebbles, chert, quartzite, and organic materials. The sand does not have clay in it. All three types of rocks, sedimentary, metamorphic and igneous are found in this area. The elevation is 850 feet. Continuing up to elevation of about 950 feet there is a sand and gavel terrace making it a depositional terrace. In Saint Peter there is Lake Emily which is referred to as a hummocky topography due to its rolling hill and hole demographic. It is known as a kettle lake and there is quaternary till found …show more content…
The deposition of ordovician dolomite could have been formed from flooding with high sea levels. The melting of glaciers could have carved out the sides of the rocks and areas where there are bluffs that cause the rocks to cliff at a higher elevation. The quaternary alluvium is most likely deposited from where there was erosion of sedimentary rocks from the movement of water or wind erosion. The large boulder found at the Kasota Prairie was most likely brought in from a glacier. It is an erratic boulder meaning the material the boulder is made out of, does not match its surroundings. It does not match due to it being brought in by a glacier. At the gravel pits south of Kasota, the area was formed by a glacial river melting and forming the area. It moved rocks into the area causing it to have multiply types of rocks from each group. Lake Emily was formed by a left over block of ice from a glacier, sitting on the land pushing it down forming a hole, and later melting. Kettle lakes are filled with sediments and other minerals. Spring Lake used to be apart of the Minnesota river. With the continual flooding and movement of the river, it created a whole that is away from the river, causing Spring Lake to form. As the river shifts through time it floods other areas forming lakes. The Saint Peter area also has stream scarps and gullies which are formed by the
This could have been an extended formation from the first stop because they have similar substances but this does not necessarily mean they are the same. We continued off the map of Saint Peter to the cliff between the flood plain and Kasota Prairie and found cambrian sandstone and ordovician dolomite. These rocks were bedded and had an obvious distinction line between the two units. At the Kasota quarries in the south of Kasota there is a large amount of ordovician dolomite. In this area, there was a large amount of dolomite and it was used for construction, used as tile, and stone for buildings. In the gravel pits south of Kasota there is a large amount of quaternary sand and gravel that has sand pebbles, chert, quartzite, and organic materials. The sand does not have clay in it. All three types of rocks, sedimentary, metamorphic and igneous are found in this area. The elevation is 850 feet. Continuing up to elevation of about 950 feet there is a sand and gavel terrace making it a depositional terrace. In Saint Peter there is Lake Emily which is referred to as a hummocky topography due to its rolling hill and hole demographic. It is known as a kettle lake and there is quaternary till found …show more content…
The deposition of ordovician dolomite could have been formed from flooding with high sea levels. The melting of glaciers could have carved out the sides of the rocks and areas where there are bluffs that cause the rocks to cliff at a higher elevation. The quaternary alluvium is most likely deposited from where there was erosion of sedimentary rocks from the movement of water or wind erosion. The large boulder found at the Kasota Prairie was most likely brought in from a glacier. It is an erratic boulder meaning the material the boulder is made out of, does not match its surroundings. It does not match due to it being brought in by a glacier. At the gravel pits south of Kasota, the area was formed by a glacial river melting and forming the area. It moved rocks into the area causing it to have multiply types of rocks from each group. Lake Emily was formed by a left over block of ice from a glacier, sitting on the land pushing it down forming a hole, and later melting. Kettle lakes are filled with sediments and other minerals. Spring Lake used to be apart of the Minnesota river. With the continual flooding and movement of the river, it created a whole that is away from the river, causing Spring Lake to form. As the river shifts through time it floods other areas forming lakes. The Saint Peter area also has stream scarps and gullies which are formed by the