Why didn’t the small post apocalypse survivor dinosaurs just refill the niches? Did the asteroid alter the planet in some way fundamentally different than the prior 200M years?
Edit: (collaborative clarification with my 5yo, with paraphrasing): Birds are boring dinosaurs. Why didn’t the big dinosaurs (non bird) come back? Why are there no mammal-sized (non bird) dinosaurs? (e.g., mouse through elephant-sized or even whale size)
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The world wide layer of the rare (on earth) metal Iridium that marks the KT boundary is accompanied by another layer world wide of fossilized fern spores. Ferns are excellent early colonizers of broken ground.
Entire forest ecosystems were globally replaced by barren naked soil. All of the large dinosaurs that were well adapted to such ecosystems died out with those ecosystems.
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