Temporal Span Flashcards
(15 cards)
When did Rhipidistians and coelacanths split?
Early Devonian around 400Mya
When did Elpistostegalia originate?
Middle Devonian
What was the earliest Therian mammal and when did it live?
Juramaia 150Ma in the Late Jurassic
List the big extinction events spanning the Devonian to Jurassic
Late Devonian Extinction, Carboniferous Rainforest collapse, End-Permian and Triassic-Jurassic
What were the climate conditions in the middle Devonian?
Global warming with oceanic hypoxia and anoxia.
What is a possible evolutionary push towards tetrapodomorphs starting to breathe air?
Oceanic anoxia
What extinction marks the boundary between the Devonian and Carboniferous?
Hangenberg, possibly 7th worst extinction.
Were tetrapods impacted by the Hangenberg extinction?
No, not much.
Which extinction event is closely tied to Romer’s Gap and when did it occur?
Hangenberg… Boundary between the Devonian and Carboniferous
What is Olson’s Gap and when did it occur?
Possibly an extinction event or a gap in the fossil record. Occured at the end of the Capitanian, Guadalupian, Late-middle Permian.
What caused 80% loss of tetrapod genera in the Karoo Basin, and when? Which therapsids became extinct?
End-Capitanian (Olson’s Gap/ Extinction). Dinocephalians extinct.
What is the Carnian-Pluvial Event?
Middle Triassic planetary warming and increase in mega-monsoons
What terminates the Karoo Supergroup sequence?
Jurassic Flood Basalts
Which faired better at the end of the Permian, Archosauroformes or therapsids?
Archosauroformes
What is the earliest undisputed Synapsid? When did it live?
Archaeothyris - Late Carboniferous
