Describe the nature of the contacts with preceding and succeeding units if this information is available.
Lithological Descriptions / Stratigraphy of the Area
You should systematically describe each of your mapping units in turn, starting with the oldest, using correct strati-graphic nomenclature. The stratigraphy should include a description of the principal features of each mapped formation and the nature of the boundaries between each unit. Correlations with any previously established stratigraphy should be noted.
Clearly state how your stratigraphy is divided into formations. You might be using the same as outlined by the literature because they are appropriate subdivisions for your area, but you may choose to merge two units into one if they are not clear to distinguish or too small to map individually.
Ensure that you separate clearly your own observations and conclusions from information derived from the literature. This section should be clearly linked to your stratigraphic column.
Describe the nature of the contacts with preceding and succeeding units if this information is available.
Describe the lithologies which comprise each unit, including description of thin sections, fossils, and any sedimentary structures.
State the thickness of the unit and the evidence upon which your estimate is based and discuss any lateral variations in thickness.
Discuss how you reached your estimate of thicknesses of sedimentary sequences.
Identify the fossils contained in the unit. Indicate the age of the formation, and if fossil evidence has been used indicate what it is.
Discuss indicators of way–up or palae-ocurrents and try to work out directions. Use information such as grain sizes, lithologies, sedimentary structures and fossils to determine the environment of deposition for each unit.
For metamorphic rocks what minerals may be used to indicate grade?
Intrusive igneous rocks are usually described after all the other units have been described.