"There is no layer of flood deposits in the right age range that extends globally. There are lots of flood deposits - we know what they look like - but they are small and isolated incidents, compared to a putative "great flood"
I am not a geologist or have really looked into this but i am assuming you are using a dating system used by natuarlist which extends for billions of years. But when looking from a creationist's perspective where the earth is only a few thousand years old. So all of the layers in this "age range" only extend to about 6000 years. Lets say the flood took place 5000 years ago. If you go by an evolutionists dating system which extends to millions of years and then go back 5000 years in that system to when it took place ofcoarse you are going to not find and flood deposits, because if you go by creation acount the 5000 years down is really more like 5 million years down according to the evolutionists dating system.
I hope that makes sense. It like measure somthing in meters and kilometers and then comparing them simply by the number.