All trace of Man could vanish in 200,000 years

If Man just disappeared from the face of the Earth (most likely cause a virus), how long would it take for evidence of our existence to disappear?

Or, to put it another way, how easily could evidence of advanced ancients have disappered?

The Times tells us that if we disappered today:

By tomorrow, street lights and house lights left on by their former occupants would start to go out.

Streets and cultivated fields would be the next to go. Within 20 years village streets and rural roads would have vanished under a matting of weeds; fields would be overgrown within months. Urban streets would take a little longer, but even in huge man-made sprawls, such as London and Birmingham, plants would have taken over in about 50 years.

Buildings would decay rapidly. Wooden structures would collapse first, assaulted by bugs and grubs. All such homes would be gone in a century.

Glass and steel tower blocks that create city skylines would mostly fall down within 200 years. Brick, stone and concrete structures would last longer. With exceptions — the pyramids are already 3,000 years old — by the next millennium there would be little more left than ruins.

....Carbon dioxide emissions wouldcontinue to cause climate change for another 100 years, but after 1,000 years all would be back to pre-industrial levels, with all man-made traces vanishing in 20,000 years.

However, the most radioactive of untreated nuclear waste would not be safe for up to two million years, John Large, an independent nuclear consultant, said. Man-made chemicals, especially perfluorinated types, would not break down for up to 200,000 years, although it is thought that they would have been buried long before then.

....In 50,000 years all that would remain would be archaeological traces. Only radioactive materials and a few man-made chemical contaminants would last longer — an invisible legacy.