Some of the most useful fossils for dating purposes are very small ones.
For example, microscopic dinoflagellates have been studied and dated in great detail around the world.
Relative dating is used to arrange geological events, and the rocks they leave behind, in a sequence.
While digging the Somerset Coal Canal in southwest England, he found that fossils were always in the same order in the rock layers.Cross-cutting relations can be used to determine the relative ages of rock strata and other geological structures.Explanations: A – folded rock strata cut by a thrust fault; B – large intrusion (cutting through A); C – erosional angular unconformity (cutting off A & B) on which rock strata were deposited; D – volcanic dyke (cutting through A, B & C); E – even younger rock strata (overlying C & D); F – normal fault (cutting through A, B, C & E).Photo from Glen Canyon National Recreation Area, Utah.Relative dating is the science of determining the relative order of past events (i.e., the age of an object in comparison to another), without necessarily determining their absolute age, (i.e. In geology, rock or superficial deposits, fossils and lithologies can be used to correlate one stratigraphic column with another.As he continued his job as a surveyor, he found the same patterns across England.