Dating rock com


26-Nov-2017 05:29

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).The principle of cross-cutting relationships pertains to the formation of faults and the age of the sequences through which they cut.

For inorganic matter and for older materials, isotopes of other elements, such as potassium, uranium, and strontium, are used.As a result, xenoliths are older than the rock which contains them.