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Find out why there is no Carboniferous Limestone visible around the Somerset area.

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A2 Extended Coursework Contents Contents 1 Introduction 2 Background Information 2 Planning 7 Desktop Investigation 7 Methods of Analysis 7 Fieldtrip Planning 8 Measuring the Height of the Cliffs 8 Collecting Mudstone to determine CaCO3 8 Look at the ORS at the Quarry on the Quantocks 8 General Equipment Used for Collecting Other Data 9 Lab Work Planning 9 Possible Errors and Limitations 9 Health and Safety Issues 10 Fieldtrip Hazards 10 Lab Work Hazards 11 The Fieldtrip 12 Measuring the Height of the Cliffs 12 Collecting Mudstone to determine CaCO3 13 General Equipment Used for Collecting Other Data 14 Rock Measurements 15 Lab Work 16 Introduction 16 Method 16 Rock Sample 16 Control 17 Calcium carbonate content 17 Results 17 Rock Sample- Before 17 Rock Sample- After 18 Control- Before 18 CaCO3 Sample- After 18 Conclusion 18 Hypotheses Proved/Disproved 20 No Limestone Deposited At All 20 Limestone deposited then eroded to nothing. 21 Limestone deposited and then folded and faulted below the surface. 23 Limestone has been overlaid by other Rocks. 24 Human Activities have removed all the Limestone. 24 Combination of the Above 25 Conclusion 25 Evaluation 26 Errors and Solutions next time in the Collection of the Data 26 Improvements and Add-ons to this Investigation 28 Acknowledgements 29 Bibliography 29 Appendix A...............................................................................................30 Appendix B...............................................................................................35 Introduction In this investigation, I am trying to find out why there is no Carboniferous Limestone visible around the Somerset area. There is lots of Carboniferous Limestone in Wales and in the Mendips with other Carboniferous Rocks in Devon but there is none around this area. Looking at the OS map at the end of this project, you can see that all the limestone that is visible is in a tiny outlier at Cannington where the Limestone is quarried. This investigation will try to find out why there is no Carboniferous Limestone in this area but there is Limestone surrounding us. ...read more.


The camera will be used for taking photos of the methods used to help with the method writing up. It will also be used to make a more accurate fieldsketch than the one I was able to draw on site which will be shown in Appendix A. The results for this part can be seen at various points in this project but this data will mostly be found in the Appendixes as additional information. Rock Measurements This part of the fieldwork was to find and measure different components of the Rocks, the size and shape of the Rocks, and the average content of Limestone pebbles on the Beach at Blue Anchor. Equipment Required * Callipers * Ruler * Quadrat * Prepared Sheet of Measurements of Rock Axis * Prepared Sheet of Quadrat Measurements For the Rock sizes, I will be using the three axis of the Rock; length, width, depth, and this will be measured using the callipers and the ruler. They will be recorded on the prepared sheet. The A-axis is usually the longest axis, then the B-axis is the next longest, followed by the C-axis which is the shortest axis. For the Quadrat measurements, I will be creating co-ordinates within a 10-metre area by generating random numbers using a calculator. This will give me some random sets of numbers. I will be recording the size of the Rock, type of Rock, proportion of minerals, and relative ages of the Rocks. The results for this piece of the fieldtrip are in Appendix B but like with all the results mentioned in this section and the lab work, it will be properly explained and interpreted in the conclusion at the end of the Lab Work. Lab Work Introduction The Lab Work was to try to find out how much calcium carbonate content there was in the Triassic Mudstone that was found in abundance at Blue Anchor Beach. ...read more.


* To improve the limitation regarding a different or unfair amount of calcium carbonate within the sample, I will be looking at the other results that the other people doing this investigation got and made a prediction that what I got as a percentage calcium carbonate, most of the group got about the same amount. There were a couple of odd results but most of them did follow the general pattern that emerged of about 30% calcium carbonate. * The final limitation that was found with the lab work was to do with the natural calcium carbonate that would have been present in the Mudstone. There is very little way of finding out what the actual content from the possible erosion of the Limestone and not naturally occurring. To counteract this problem, I would need to find a different sample of the Rock, but from the cliff way above the high-tide line. I would have assumed that the sample had not been touched by the sea and therefore, any calcium carbonate found in the Rock has come solely possibly from the Limestone that had been eroded. Improvements and Add-ons to this Investigation To make improvements to this investigation in the future, I would need to carry more extensive research into the internal geology of the Quantock Hills. This would help to understand where the limestone has gone. To gather more background information than what was gathered in this investigation, I would have emailed a specialist in the subject and the British Geological Society as well so that they could give me additional information, which would have been useful in this investigation. Acknowledgements I wish to thank my Mum and Dad for proofreading my investigation. In addition, I wish to thank Ros Smith, My Geology Teacher, who helped me with the geological issues that I found whilst doing this investigation. I wish to thank Chris Marlow, the physics technician. Chris helped with the lab work to extract the calcium carbonate from the Mudstone and he drove the minibus to Blue Anchor so we could get the data. ...read more.

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