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Dnsr notes 21


What was the formation of earth's land during the Triassic period? Pangaea, the supercontinent
Due to the land formation, what were dinosaurs able to do? They were able to move around and were wide-spread.
Cosmopolitan Wide-ranging and very similar to each other
Endemic (late cretaceous) Particular groups restricted to differing continents
How do solids and fluids react to heat? solids become hot on the surface and cool on the bottom while fluids distribute the heat more evenly.
Will a fluid or solid change temperature quicker? Solid
How was the climate in the Triassic? Pangaea had much more extreme temperatures and water precipitation.
Why were the temperatures more extreme? There wasn't water breaking up the land forms and aiding in regulating temperature. This caused the land to heat up quickly and cool quickly.
Why were the seasons extreme? monsoons in the wet season, and hot temperatures in the dry season.
What caused the monsoons? Moisture from oceans (Tethys Sea) was pulled into the northern hemisphere low-pressure cell.
What was the Late Triassic climate? generally warm and dry at lower latitudes, with strong seasonality.
What was the largest mass extinction that the world as ever experienced? Permo-Triassic Extinction
What percentage of species from land and from ocean were wiped out in this extinction? Greater than 70% for ocean species and over 50% for land species.
What are some theories for the cause of this extinction? Volcanism, asteroid collisions, and dramatic changes in global sea levels.
What is the strongest piece of evidence for the cause of the extinction? Massive outpouring of lava in Russia called the Siberian Traps may have released a large amount of greenhouse gases, which caused "runaway" global warming and upset the chemical balance in the oceans.
What were the tree species in the Triassic? Cycads, cardioids, conifers, ginkgoes, ferns, and seed-ferns
How did vegetation differ from the early to late Triassic? Early Triassic consisted mostly of pteridophyte ferns and gymnosperms. Late Triassic, gymnosperms such as conifers and cycads dominated.
What did gymnosperms have to ward off predators? tough, spiny foliage and likely rich in chemical defenses.
Which groups of animals appeared during the Triassic? Dinosaurs, insects, frogs, salamanders, turtles, lizards, crocodiles, and mammals
Triassic was not only known for "Dawn of the Dinosaurs" but for "Dawn of the ---" "Dawn of the Modern Ecosystem"
What was one of the most important mammal groups during the Triassic? Dicynodonts
Describe dicynodonts slow-moving, bulky, closely related to mammals
Which reptiles appeared in the Triassic? archosaurs (crocodiles, dinosaurs, pterosaurs, etc.)They all have an antorbital fenestra
Which group followed the first line of crocodiles? Crurotarsi
Which group evolved into pterosaurs, dinosaurs, and birds? Ornithodira
Which species were in the crurotarsi group? aetosaurs, phytosaurs, rauisuchians, early crocodylomorphs (small, bipedal)
What is a basal dinosauromorph? A species which is closely related to dinosaurs but not in the group.
What are some of the Triassic basal dinosaurs? lagerpetids and silesaurids
230 mya, which 3 species were the earliest of the dinosaurs? Eoraptor, Herrerasaurus, and Eodromaeus
Where were these dinosaurs found? The Ischigualasto Formation
Which is the most primitive sauropodomorph? Panpahgia
Which is the most primitive ornithiscian? Pisanosaurus
What were three characteristic of the first dinosaurs? Open hip socket, distinct femoral head, and three vertebrae incorporated into the pelvis.
From 215 mya, how long did dinosaurs dominate? the next 135 million years
What gave dinosaurs competition, or a competitive edge over other species? Fully upright posture, bipedalism (free hands), speed, intelligence, warm-blooded
Does the fossil record support the competitive edge hypothesis? No, dinosaurs lived alongside tetrapods and didn't become dominant over them.
How long ago was the end-Triassic extinction? 201.5 mya
What did the end-Triassic extinction affect the most? What species? Plants and animals. rhynchosaurs, dicynodonts, and aetosaurs.
What caused conifers to become dominant? The absence of many groups of seed ferns
What is the strongest hypothesis as to what caused the end-Triassic extinction? Mass outpouring of lava which released large concentrations of greenhouse gases. (Similar to the permo-triassic extinction)
Why did some dinosaurs survive through these two mass extinctions? Luck of the draw or they have characteristics which allow them to survive intense global warming and climate change.
Created by: Chelseagirl2508
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