EAPS 112 Exam 3 Questions & Answers 2023/2024
What are the period of the Mesozoic era? - ANSWER-Triassic (251 - 199 mya)
Jurassic (199 - 145 mya)
Cretaceous (145 - 65 mya)
~ 190 million years of geologic time
What were the tectonics of the Triassic like? - ANSWER-Pangea was completely as...
EAPS 112 Exam 3 Questions & Answers
2023/2024
What are the period of the Mesozoic era? - ANSWER-Triassic (251 - 199 mya)
Jurassic (199 - 145 mya)
Cretaceous (145 - 65 mya)
~ 190 million years of geologic time
What were the tectonics of the Triassic like? - ANSWER-Pangea was completely assembled (Cimmerian
and Cathaysain Orogenies), but starting to move apart. The sea level was low, close to modern time. Lots
of deserts far away from seas.
What was the marine life like in the Triassic? - ANSWER-Permian extinction had wiped out: trilobites,
corasl, bryozoans, and others. Recovery was slow, but cepahlopods and conodonts recovered quickly.
What is an icthyosaur? - ANSWER-Marine reptile that first appeared in the Triassic, it had a dolphin like
body.
What is a Plesiosaur? - ANSWER-Marine reptile with a euryapsid skull type, a broad body, and large
paddle-like limbs (kind of like the Lock Ness monster).
What was the terrestrial life like during the Triassic? - ANSWER-The land plants were not affected much
by the extinction. Gmynosperms dominated the landscape:
ferns, conifers, cycads, and ginkgos.
What were the three land vertebrates that appeared during the Early Triassic? - ANSWER-Frogs, turtles,
and primitive archosaurs.
What is an archosaur? - ANSWER-Reptile having a diapsid skull type with teeth in sockets.
Includes crocodiles, pterosaurs, dinosaurs, and birds.
, What was the Rioaaribasaurus? - ANSWER-It was one of the earliest dinosaurs, a small bipedal animal.
When did mammals first appear? - ANSWER-Mammals first appeared in the Late Triassic. Mammals
remained small and inconspicuous throughout the entire Mesozoic Era (like rodents).
How did the Triassic end? - ANSWER-There was a mass extinction in the marine ecosystem, probably due
to a climatic shift and a large sea level drop (observed with floral evidence).
What was the tectonics like during the start of the Jurassic? - ANSWER-Global sea levels was one of the
lowest in history, Pangea was starting to rift apart.
What was the marine life like during the Jurassic? - ANSWER-The marine predator-prey system was in the
midst of another escalation (called "mesozoic marine revoluton"). The appearance of ammonoids
(predatory mollusks) and belemnoids (relative of squid appeared).
What was terrestrial life like during the Jurassic? - ANSWER-Gymnosperms were the most common land
plants: Cycads, conifers, ferns and ginkgos.
Provided much of the food for the herbivorous dinosaurs and mammals.
What are Saurichian Dinosaurs? - ANSWER-They are dinosaurs with a "lizard-like hip", which includes
theropods (most carnivores) and the sauropodomorphs (giant herbivores sauropods).
What are Ornithischian Dinosaurs? - ANSWER-They are dinosaurs with a "bird-like hip", which includes
mainly herbivores.
What are theropods? - ANSWER-A clade of saurischian dinosaurs having bipedal gait, and at least
primitively, teeth adapted for carnivores. (The clade includes birds.)
Theropods often had long strides, meaning they could move quickly.
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