Does this mean the earth is warming up as it has in the past?
Yes.
as it has in the past?
Probably not.
I suggest that a correlation of these sediment deposits be compared to the deep sea sediment deposits that have been collected from oil explorations as well as the project Mohole activities which attempted to "dig deep" into the past during the 1968 IGY(International Geophysical Year I think).
Compare these findings to volcanic eruptions and see if there is a correlation since volcanic activity adds much more CO2 to the atmosphere.
Once its clear that this correlation exists I suggest that AlBlore be arrested for inventing CO2 and volcanos!!!