Mass extinctions. No 'darkness at noon' to do in the dinosaurs?
Kerr
Richard A
RA
D000818:Animals; D025061:Dinosaurs; D004391:Dust; D017753:Ecosystem; D005390:Fires; D018543:Minor Planets; D010788:Photosynthesis; D012906:Smoke
D004391:Dust; D012906:Smoke