The Great Unconformity in Eldorado Canyon, Pennsylvanian Fountain Formation on top of the Proterozoic Coal Creek Quartzite
In geology, unconformities represent missing time. Typically applied to surfaces in the rock record that represent erosion and/or non-deposition, and across which there is a significant leap in time. Unconformities are formed through a variety of processes, but the lack of a rock record should not be interpreted as a lack of geologic information. Indeed, unconformities speak to important processes, and can be key markers and indicators.
This post serves as the great Apparent Dip unconformity. Erosion and non-deposition are great analogs for my missing time, but I hope to start recording again.
Apparent Dip 