As if "heavy rainfall and aridity" wasn't a clue, then what better description of a world-wide flood could there be than "extensive inundation of continents"? That's what happens in a world-wide flood.
Extensive Inundation of Continents
Heavy Rainfall and Aridity
If the rocks of the Devonian tell a tale of the world being flooded and then drying out, why are we surprised?
Scorpions and Millipedes, first Air-breathing Animals
The first air-breathing animals to appear in the stratigraphic column were the ones who just happened to be living on the beach or at the coast during Noah's flood.
Mild Climates
We're already seen the descriptions of the Cambrian and Ordovician start with a statement on climate. It's a subtle way to pay homage to the fact that a vast amount of water moved a vast amount of sediment.
Graptiloids, Nautiloids, Cystoids in Maximum Abundance
If a sedimentary rock is full of the remains of Graptiloids does it means that the Graptiloids were in their maximum abundance? No, it means that the place where the Graptiloids lived got buried in sediment.
First Vertebrates and a Great Variety of Marine Invertebrates
In Noah's flood the sea floor was buried first, that's called the Cambrian. The things which were swimming just above the sea floor got buried next, that's called the Ordovician.
Warm, Epicontinental Seas, Again
Epicontinental seas supporting an abundance of green and red algae. What's the difference between Cambrian and Ordovician? The Cambrian is the sea floor, the Ordovician is the open ocean immediately above it.
Warm, Mild Climates
Erosion happens as the result of precipitation and flooding. “Warm, mild climates” is a way of implying that warm temperatures caused increased evaporation from the oceans.
Abundance of marine invertebrates
Abundance of marine invertebrates; first trilobites and foraminifers. That's what lives on the floor of the ocean. That's why it's at the bottom of the stratigraphic column.
Climate Warm and Equable
“Warm, equable climate” are key words which allow us to pry open the subtle deception (or strong delusion) which has been crafted as a way to break down Noah’s flood into small units and spread them across time.