1. At Marino Rocks there is a substantially difference between the rock types on the ‘beach’. Some of these are grain size, age, complexion very common rock types that can be found at Marino Rocks include: sandstone and siltstone. Sandstone is a sedimentary rock composed of sand-sized grains of mineral, hence why its called ‘SAND-stone’. It also contains a cementing material that binds the sand grains together. This is in contrast to siltstone, silt is a size term used for material that's smaller than sand but larger than clay, once again, this is why it’s called ‘SILT-stone’. The siltstone at Marino Rocks is generally mostly pure, containing very little sand or clay. It is evident that the siltstone is far greater in age then most of the
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There are occurrences of sub-aerial erosion at Marino Rocks. Sub-aerial, like sub-marine simply means below the atmosphere, i.e. any types of erosion occurred in between ocean level and the atmosphere. Therefore sub-aerial erosion is most visible on the top of the yellow sandstone cliffs because the grain size on top of the cliff is larger and therefore more unstable, this is because it is constantly exposed to the weathering and erosion by wind and rain. The general term for most of sub-aerial erosion is Mass movement, massive movement is essentially the movement of weathered material moved by gravity. When a cliff is unstable and material may fall off. There are five types of mass movement: rockfall, soil creep, landslides, mudflow and …show more content…
Below (Figure 1) is a fully labelled cross-section of Marino Rocks that includes details on sandstone, siltstone potholes, honeycomb weathering, tool stones, shingles beach, rock strata, gutters. This image has been redrawn digitally using the sketch in the noting worksheet.
1. A breakwater has been constructed at Holdfast Shores because of some inconveniences and also because the area is for recreation. The breakwater was built because the sediment flow in the abrasion zone was being weathered away, it is clear why the breakwater was therefore constructed. If the erosion and weathering of the sediment flows continued the prime real estate and the area would begin to decay. It is a barrier placed offshore to absorb the impact and effects of ocean waves and release calmer waves back out. It can counteract itself as it may adversely affect many silt deposits.
1. Below (Figure 2) is a drawing of Holdfast Shores that identifies the coastal management strategies in the area and the impact it has on sediment flows. Once again this drawing is a digital remake of the one drawn in the noting worksheet. 1. Figure 3 (Next Page) provides a clear example of the beach and dune system present at the Tennyson Dunes, the sketch covers from the water’s edge to the back on the tertiary
There are occurrences of sub-aerial erosion at Marino Rocks. Sub-aerial, like sub-marine simply means below the atmosphere, i.e. any types of erosion occurred in between ocean level and the atmosphere. Therefore sub-aerial erosion is most visible on the top of the yellow sandstone cliffs because the grain size on top of the cliff is larger and therefore more unstable, this is because it is constantly exposed to the weathering and erosion by wind and rain. The general term for most of sub-aerial erosion is Mass movement, massive movement is essentially the movement of weathered material moved by gravity. When a cliff is unstable and material may fall off. There are five types of mass movement: rockfall, soil creep, landslides, mudflow and …show more content…
Below (Figure 1) is a fully labelled cross-section of Marino Rocks that includes details on sandstone, siltstone potholes, honeycomb weathering, tool stones, shingles beach, rock strata, gutters. This image has been redrawn digitally using the sketch in the noting worksheet.
1. A breakwater has been constructed at Holdfast Shores because of some inconveniences and also because the area is for recreation. The breakwater was built because the sediment flow in the abrasion zone was being weathered away, it is clear why the breakwater was therefore constructed. If the erosion and weathering of the sediment flows continued the prime real estate and the area would begin to decay. It is a barrier placed offshore to absorb the impact and effects of ocean waves and release calmer waves back out. It can counteract itself as it may adversely affect many silt deposits.
1. Below (Figure 2) is a drawing of Holdfast Shores that identifies the coastal management strategies in the area and the impact it has on sediment flows. Once again this drawing is a digital remake of the one drawn in the noting worksheet. 1. Figure 3 (Next Page) provides a clear example of the beach and dune system present at the Tennyson Dunes, the sketch covers from the water’s edge to the back on the tertiary