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You are asked to provide a description of British Geological Survey Bristol Special Sheet. This should be written and organized along the same lines as those you have been provided with already for the Cocker mouth, Shrewsbury and Sanquhar sheets. It should be word processed, double-spaced (so I can write comments) and the text should be ~1500-2000 words long. It should include a simplified geological map, a stratigraphical column, a structural map, and you should also include other small diagrams to illustrate particular stratigraphical points and/or structures. The extent to which you follow this format, provide correct geological interpretations, and include a range of appropriate diagrams will form the basis for the allocation of marks. You are provided with a copy of the feedback given to last year’s group for the equivalent piece of assessed coursework.
FEEDBACK FOR DESCRIPTION OF HAVERFORDWEST SHEET
Overall the standard was better than last year with most of you sticking to the suggested format and guidelines. Mark distribution was as follows: A 5, B+ 13, B 29, C 13, and F 0.
1) Many of you clearly have problems with written language and spelling. Always put your text through a spell-check before you submit it. Read through it before you submit it, or swap with a colleague – can you understand what each of you has written? Remember that the easiest way for a potential employer to sift through a big pile of applications is simply to automatically bin all those that have spelling/grammatical errors. This is not a trivial issue – potential employers need their employees to have good written communication skills and to be able to write clear and accurate reports. If I had a pound for every incorrect and seemingly random use of a capital letter or an apostrophe I would be a rich man.
2) There are a lot of complex stratigraphic relationships and a great deal of complex structural geology to describe. Many of you simply lost marks because you did not provide sufficient detail and/or provided poor supporting diagrams.
3) There was confusion about the status of the boundaries of certain rock units which are mostly/all faulted, but some of you described as unconformities – this is simply not known.
4) There were quite a few references to Precambrian rocks being “brought to the surface” by faulting (presumably reverse or thrust faulting). You CANNOT “bring rocks to the surface” by this mechanism alone. First of all, you need to ERODE the overlying rock mass.
5) Quite a few of you included unconformities in the structural section for some bizarre reason!
6) Faults received cursory treatment from many of you. If you state that a given fault is a normal fault (for example) then you need to provide the supporting evidence. Many of you sketched faults that had obvious apparent lateral offsets, describing these as strike-slip faults, but not taking into account that they could also be normal faults…..think back to last
Year’s map work practicals. Apparent strike-slip offsets can be produced by normal faults affecting dipping strata.
7) Many of you still indulged in over-speculation about depositional environments and the nature of unexposed geological relationships. Stick to what can be gleaned from the map.
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