Carboniferous and Permian Life was SO COOL! If I were in charge of names, I would call this time frame the age of trees and amphibians! (But maybe by the Permian the age of amphibians would've become the age of reptilians instead lol)
Land was newly inhabited by vegetation and trees were spreading. Moist swamp environments were at there most widespread and these swamp environments allowed fish to branch out onto land. Starting with Tiktaalik, lobe finned fish began walking in the shallow margins of swamps and not too long after that they had fully evolved into amphibians which fully walked on land after their development in the water. As amphibians evolved and diversified, eventually the egg shell evolved, eliminating the necessity of laying eggs (and living) near water. These newly evolved amniote egg laying creatures were reptiles. Reptiles rapidly diversified and took over the land from amphibians. These reptiles eventually evolved into therapsids which eventually evolved into mammals and diapsids which eventually evolved into dinosaurs & birds.

References: Earth System History: https://amzn.to/3v1Iy0G

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Nontextbook books I recommend:
Oxygen by D. Canfield: https://amzn.to/3gffbCL
Brief history of Earth by A. Knoll: https://amzn.to/3w3hC1I
Life on young planet by A. Knoll: https://amzn.to/2RBMpny
Some assembly required by N. Shubin: https://amzn.to/3w1Ezm2
Your inner fish by N. Shubin: https://amzn.to/3cpw3Wb
Oxygen by N. Lane: https://amzn.to/3z4FgwZ
Alien Oceans by K. Hand: https://amzn.to/3clMx1l
Life's Engines: https://amzn.to/3w1Nhke

Tools I use as a geologist/teacher/student:
Geology field notebook: https://amzn.to/3lb6dJf
Geology rock hammer: https://amzn.to/3DZw8MA
Geological compass: https://amzn.to/3hfbdLu
Geological hand lens: https://amzn.to/3jXysM5
Camera: https://amzn.to/3l6fGRT
Carbonneutral pencil bag: https://shrsl.com/3cvjv
Carbonneutral backpack: https://shrsl.com/3cvkc

0:00 Geologic Timing
0:35 After Late Devonian Extinctions
2:04 Shift to Rapid Swimmers
2:56 Brachiopods & Mollusks
3:37 Mississippian Crinoid Meadows
5:08 Best Late Paleozoic Index Fossils
6:33 Shift in Reefs
8:07 Carboniferous Swamp Vegetation
11:20 Carboniferous Woodland Trees
12:38 Freshwater Infiltration
13:13 Giant Insects
14:39 Amphibians were first on land
15:22 Amniote Eggs allowed Terrestrial Lifestyle
16:25 Reptiles replaced Amphibians
17:09 Dimetrodon led to Mammal Ancestors
17:32 Reason for Therapsid Success
18:29 Related videos & references

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