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 :)
âº to move away from the main subject you are writing or talking about and to write or talk about something else: 1  But I digress. To get back to what I was saying, this poem reflects the poet's love of nature and his religious beliefs. 2  The lecturer temporarily digressed from her subject to deal with a related theory.