The Miocene was the first epoch of the Neogene period (23-2.5 million years ago), followed by the much shorter Pliocene epoch (5-2.6 million years ago); both the Neogene and Miocene are themselves subdivisions of the Cenozoic Era (65 million years ago to the present). Climate and geography.
The dictionary meaning of the word Digress is 'to leave the main subject temporarily in speech or writing.' or simply deviate. As you say,I digress means  I am straying from the main subject right now. . Like in this sentence - 'I need to digress a bit to let the ink dry.'. Hope this helps :)
Ingress and Egress. In trench terminology, ingress and egress are words used to describe access into and exits from the trench. According to OSHA, trenches that are 4 feet or deeper require stationary egress options. Ladders, for example, must be provided and spaced such that trench workers do not have to travel more than 25 feet to the nearest ladder. This helps workers make quick getaways in a flood or cave-in.