"If humans were to go extinct tomorrow, then our impact on the biosphere would be recognisable as an epoch boundary – like the boundary between the Pleistocene and Holocene," Williams pointed out.
The Baltimore-set epic may have had just a fraction of the ratings of Simon Cowell's talent shows on either side of the Atlantic, but the HBO series was genuinely epoch-making, redefining the boundaries and aspirations of contemporary TV drama.
When talking about decades as cultural epochs, we often use boundaries more arbitrary than January 1st and December 31st.
It is 1989 that is seared into the global consciousness, like 1789 or 1945 or, indeed, 1914: less a date than a universally understood marker, the boundary between one epoch and another.
The value for the scale parameter was set so that the age at the 95% quantile was roughly equivalent to the lowermost boundary on the geologic epoch containing the relevant fossil.
The historical term, used during Russia's imperial epoch, does not denote any recognized national or regional boundaries.
For Hazan, each boundary-hop signalled "the emergence of a new epoch".
Among conodonts (toothlike remains of primitive chordates), a significant radiation was indicated by species within the Pterospathodus amorphognathoides biozone, which straddles the Llandovery-Wenlock boundary and includes the late Telychian Age (Llandovery Epoch) highstand.
The boundaries between different intervals in the chart of geologic time (e.g., ages, epochs, periods, and eras) represented sudden changes between or within different layers of rock.
