Geography Fieldwork

A Level

Data presentation

3. Data presentation

Present your findings with a range of quantitative and/or qualitative techniques. Each technique should be accurately drawn and appropriate for the information being presented. Here are some suggestions.

Rose diagram: orientation of corries

Rose diagrams can be used to show the orientation of particular glacial features, such as corries. The raw data has been been sorted into 45° intervals, as shown in the table.

Area N - NE NE - E E - SE SE - S S - SW SW - W W - NW NW - N
Carneddau 1 4 2 1 0 0 0 1
Glyders 5 8 0 0 0 0 0 2

Plot these results onto the rose diagram. Outline shapes have been used, so that the two areas can be compared.

Till fabric analysis histograms

Histograms can be used to compare clast shape (e.g. Power’s Index) or clast roundness (e.g. Cailleux Index) for more than one site. The histogram below shows Cailleux Index for two separate deposits which are suspected to be different in some way. The raw data in the table has been plotted onto a single histogram.

Cailleux Index Frequency at Site 1 Frequency at Site 2
0-50 0 6
51-100 4 15
101-150 10 11
151-200 8 11
201-250 12 16
251-300 8 13
301-350 6 8
351-400 12 4
401-450 6 0
451-500 10 0
501-550 0 0
551-600 1 0
601-650 2 0
651-700 3 0
701-750 2 0
751-800 0 0
801-850 0 0
851-900 0 0
901-950 0 0
951-1000 0 0

Till fabric analysis rose diagrams

Rose diagrams can be used to present data on clast orientation. The raw data in has been sorted into 15° intervals, as shown in the table.

Clast orientation (°) frequency
0-15 0
16-30 0
31-45 0
46-60 0
61-75 11
76-90 18
91-105 12
106-120 16
121-135 6
136-150 3
151-175 0
175-180 0

Plot these results onto the right-hand side of the rose diagram.

Since each orientation will have two values 180° apart, insert a mirror image of the area itself across the 180° line.