300 Foxes and a Donkey's Jawbone
"Origin of reptiles, diversification of amphibians. Insects abundant." Here we can see how doublespeak is used to establish the premise that the evolution narrative envisions the development from simple to complex.
"Mosses, lycopods, sphenopsids, ferns, seed ferns and cordaites." The next part of the description we have of the Pennsylvanian is a laundry list of plant kinds which sounds like an ecosystem or habitat, not a period of time.
A catastrophically buried stand of calamitean sphenopsids and sigillarian lycopsids is reported from the Middle Pennsylvanian of southwestern Indiana, in the Illinois Basin.
The evidence that we have which has been assigned to the Pennsylvanian period is the total destruction of great swamps. They were buried and preserved, not formed. That's why they're now coal.
“Further intrusion of epicontinental seas?” That sounds like a world-wide flood. In fact, it’s a way of saying world-wide flood without using the words world-wide flood. It’s an ecosystem, not a period of time.
Uniformly warm, humid climates is letting us know that there has to have been significant evaporation from the oceans to put all the water in the atmosphere that was going to be necessary to flood the world.
The description of the Pennsylvanian we have is an example of how to use inductive rationalization to make the remains of an ecosystem sound like it's evidence for a period of time.