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 :)
transitive verb. 1 : to clear by digging up roots and stumps. 2 : to dig up by or as if by the roots. intransitive verb. 1a : to dig in the ground especially for something that is difficult to find or extractb : to search about grubbed in the countryside for food â Lamp.