Time and Geology Actualism-geologic processes operating at present are the same processes that operated in the past angular unconfomity- an unconformity in which younger strata overlie an erosion surface on tilted or folded layer rock archean eon-the oldest eon of earths history cenozic era-the most recent of the eras, folled the mesozoic era contacts-boundary surface between 2 different rock types or ages of rocks correlation-determining time equivilancy of rock units. rock units may be correlated... read more
