We need to understand where the Iridium anomaly is found in the stratigraphic column as compared to the sequence of Noah's flood that we can deduce from the sedimentary evidence.
The Duration of Noah’s Flood
Dinosaurs in Babylon
Babylon became a dwelling place for dragons after it had no human inhabitants. Dragons, or dinosaurs as the case may be, don't live in the same places as humans.
Dinosaurs in Hazor
Hazor became a dwelling for dragons after the people had been driven away. That's why any fossil remains in the area won't have humans and dinosaurs in the same sediments.
Dinosaurs in Jerusalem
We are told repeatedly by Jeremiah that dragons only inhabit places where there are no humans, or from where the humans have already been driven out. Judah only became a den of dragons after it became desolate.
Dinosaur Classification
Whether or not a Biblical word translated as a kind of serpent refers to something which may have been a dinosaur is context dependent. Sometimes a snake is just a snake. Sometimes a serpent is a Sauropod.
Angiosperms Rise to Dominance
This is narrative that's designed to establish the evolution premise that the Angiosperms are the most developmentally advanced kinds of plants, and so therefore have the most recent origin.
Elevation of Rocky Mountains
The elevation of the Rocky Mountains was during Peleg's tectonics, 101 years after Noah's flood. It occurs in the narrative of evolution as a way to stretch out the timescale into millions of years.
Extensive Inundation of Continents
"Extensive inundation of continents" is letting us know that this was part of a world-wide flood. The inundation is the second phase of Noah's flood.
Climate Tending to be Uniform
"Climate tending to be uniform, temperate because of extensive inundation of continents". Our period description opens up with a climate statement which lets us know that this was part of a world-wide flood.
August 20th
A world-wide anoxic extinction event above the Cretaceous/Tertiary boundary is a logical outcome if the worlds ecosystems were decomposing in the waters of a year-long world-wide flood.