Methods of lithostratigraphic correlation
- You could correlate using a sequence of beds
- Looking at the thickness of beds -thickness of thin and thick bars. such a correlation might work for identifying where you are in a coal field
- Composition of beds may be distinctive if a rare mineral present in a bed. The Cretaceous- Tertiary boundary rocks are correlated on the presence of iridium
Problems of lithostratigraphic correlation
- lateral variation - where sediment change type horizontally - deltas- sediments at source may be thicker, further away thinner
- Diachronous beds - where sediment type is laid down at different times e.g delta over the years, a continuous layer of sands is left behind. these sands get younger from land to sea - they are definitely not the same age.