Knowledge and Geological techniques Comments understanding and skills Identification in hand specimen Candidates need only have of the following sedimentary knowledge of the rocks from their composition, sedimentary rocks indicated. texture and other diagnostic features: sandstones Candidates should be able to (orthoquartzite, arkose, identify the stated greywacke), shale/mudstone, sedimentary rocks in hand limestones (shelly, oolitic, specimen and the field. It is chalk), conglomerate, breccia. understood that it might not be possible to investigate the Investigation of contrasts full range of rocks in the field between fluvial, marine and or that this list is exclusive. aeolian sediments. For exemplification of Use of logarithms in relation to mathematical skills see quantities that range over Mathematical Guidance for several orders of magnitude. A level Geology. Construction and interpretation The mathematical skills of frequency tables and identified are not exclusive to diagrams, bar charts and this section of the histograms. specification. Knowledge of the characteristics of normal and skewed distribution. Plotting of variables from experimental or other circular data. Understanding of the terms mean, median and mode. Selection and use of a statistical test. Plotting of two variables from experimental or other linear data. f. Sedimentary rocks Analysis of biogenic Candidates should be able to may result from the components in sedimentary describe the order of accumulation of rocks. precipitation of evaporate organic material minerals from seawater in (limestone, coal) or by terms of their relative precipitation of solid solubilities low – material from solution (calcite/dolomite (evaporites). gypsum/anhydrite potassium/magnesium salts).
Knowledge and understanding Geological techniques and skills Comments Identification in hand specimen of the following sedimentary rocks from their composition, texture and other diagnostic features: sandstones (orthoquartzite, arkose, greywacke), shale/mudstone, limestones (shelly, oolitic, chalk), conglomerate, breccia. Investigation of contrasts between fluvial, marine and aeolian sediments. Use of logarithms in relation to quantities that range over several orders of magnitude. Construction and interpretation of frequency tables and diagrams, bar charts and histograms. Knowledge of the characteristics of normal and skewed distribution. Plotting of variables from experimental or other circular data. Understanding of the terms mean, median and mode. Selection and use of a statistical test. Plotting of two variables from experimental or other linear data. Candidates need only have knowledge of the sedimentary rocks indicated. Candidates should be able to identify the stated sedimentary rocks in hand specimen and the field. It is understood that it might not be possible to investigate the full range of rocks in the field or that this list is exclusive. For exemplification of mathematical skills see Mathematical Guidance for A level Geology. The mathematical skills identified are not exclusive to this section of the specification. f. Sedimentary rocks may result from the accumulation of organic material (limestone, coal) or by precipitation of solid material from solution (evaporites). Analysis of biogenic components in sedimentary rocks. Candidates should be able to describe the order of precipitation of evaporate minerals from seawater in terms of their relative solubilities – low (calcite/dolomite gypsum/anhydrite potassium/magnesium salts).
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