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There are several specific types of unconformities.The three major, specific types of unconformities are included here.Ask yourself how the things that are happening in the world today might end up being recorded in the sediments that are now or soon will be deposited.
Stratigraphy started to become a formal science due to the work of a man who published under the name Nicolaus Steno in the 17th century.
To determine the nature of the contact - whether it is an intrusive contact or a nonconformity - further evidence from field investigations would be needed.
Evidence such as angular pieces of conglomerate surrounded by the granitic intrusion, and contact metamorphism of the conglomerate adjacent to the granite, would indicate that the granite is younger and intruded the older conglomerate.
An angular unconformity is an unconformity beneath which the strata were tilted or folded before deposition of the younger layers of sediment above the unconformity.
After being tilted or folded, the older layers of sediment were eroded.
Geologists still use Steno's principles, with some refinements and additions.