thinking about it, you would have layers of dry materials such as pollen and dust indicating a warmer dry period. Either way, 1000 years is a small error over that timescale, even smaller over the 800,000 years the ice cores represent.definately need to be doing something. life cant keep going on the way it currently is and expect it to work out well
and what happens if it was slightly warmer for 1000 years and 1000 layers didnt happen, but because they are not there, your count is not 1000 off, but you dont know it?