A Brief History of Geologic Time
#dinosaurs
#dinos
#paleo
#paleontology
#scishow
#eons
#pbs
#pbs digital studios
#hank green
#john green
#complexly
#fossils
#natural history
#Geologic Time Scale
#stratigraphy
#strata
#Eons
#Eras
#Periods
#Epochs
#Ages
#Hadean
#Archean
#cyanobacteria
#Proterozoic
#Eukaryotes
#Phanerozoic
#Pangea
#the Great Dying
#Mesozoic
#Cretaceous-Paleogene
#Cenozoic
#Extinction Event
#The Cambrian explosion
#trilobites
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