Geologist

Unconformities:
Source: https://www.eoas.ubc.ca/courses/eosc326/resources/Stratigraphy/unconformities-v2.htm

Unconformities represent periods of non-deposition of sediment or active erosion of strata. They help us appreciate that the geological record in any one location is NOT complete but contains gaps. Unconformities may represent important periods of activity in Earth history such as mountain building events where strata are being actively uplifted and eroded.

1. Disconformity: exists where the layers above and below an erosional boundary have the same orientation
2. Nonconformity: develops where sediments are deposited on top of an eroded surface of igneous or metamorphic rocks
3. Paraconformity: strata on either side of the unconformity are parallel, there is little apparent erosion
4. Angular unconformity: strata is deposited on tilted and eroded layers (such as at Siccar Point)

Thank you Ancient History & Mysteries World for this information.
Source: https://www.facebook.com/photo/?fbid=697471793025305&set=a.131024716336685