Geology of the Sydney Region

612 WordsFeb 17, 20182 Pages
Bronte section The cutting at Bronte is a section of rock face which made of a sendimetary layer known as Hawkesbury Sandstone. The sandstone is formed by grains of sand being compressed by the pressure of the surface above where it lies. Over time, the pressure results in the grains of sand being fused together to form a sandstone. Our group start from chainage 250 to 260. These section can be roughly divided into 4 section which are list below. Section 1,250-252.5 chainage The main features for section1 There are 3 joints located in the left corner of section one, which numbered 1 to 3 and with the dip angle of 70-90, however, it towards different direction, the first one towards 151 SE, the second one is 325 NW, the last one is 96 E. These 3 joints are parallel to each other and vertical to road surface, all fill in with sand and gray. These vertical joints mainly terminated into rock substance on one side and continued to the ground on the other side. This suggested that there is a large possibility that the defect continues to the underlying rocks. In addition, there is a continuous bedding planes within this section. The bedding plane continued to the other section, with the dip angle of 82, towards 80 E, fill with sand and the length is undefined. Some vegetation can be found at top of section. Section 2, 252.5-255 chainage The main features for section2 This section start from joints 4 to 8. For joints 4,6,7,8, they are with the dip of angle of 75-90, and

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