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Notes on video lecture:
Dinosaur Life and Extinction
Notes taken by Edward Tanguay on February 10, 2017 (go to class or lectures)
Choose from these words to fill the blanks below:
instantaneously, crocodilians, Chicxulub, Cretaceous, fluid, 228, Nyasasaurus, Mesozoic, avian, shared, sunlight, hip, 90, comet, scales, clay, reptiles, found, 11, iridium, heat, rock, greenhouse
synapomorphies
features that are between groups of dinosaurs
autapomophies
anatomical features that are not in other dinosaurs
Phanerozoic Eon (542 million years ago)
1. Paleozoic Era (524-251 Ma) ANCIENT
2. Era (250-65 Ma) MIDDLE
Triassic (250-200 Ma)
Jurassic (200-145 Ma)
(145-65 Ma)
3. Cenozoic Era (65 Ma - today) CURRENT
earliest dinosaurs
Tanzania
235 million years ago
middle Triassic
Spondylosoma
South America
middle Triassic
bipedal
legs much more robust than their arms
appeared to have been carniverous
two meters long
much like the Velociraptor
lived much later: 75-71 Ma
but the first dinosaurs were probably covered in than feathers
South America is known for early dinosaurs
Saturnalia
Late Triassic
Ma
Herrerasaurus
231 Ma
Argentina
Staurikosaurus
Brazil
225 Ma
Eoraptor
231 Ma
Argentina
Pisanosaurus
228 Ma
South America
probably omnivores
dinosaurs have a acetabulum
characteristic hole in bone
250 million years ago, an extinction event occurred
wiped out almost percent of all species of tetrapod
dinosaurs became dominant when non-dinosaurian became extinct
ornithosuchids
an extinct family of reptiles from the Triassic period that were distantly related to
rauisuchians
a group of mostly large Triassic archosaurs
diet
Tyrannosaurus Rex
quintessential carnivore
one of the last non-avian dinosaurs to exist before the Cretaceous–Paleogene extinction event
found in a variety of formations dating to the Maastrichtian age of the upper Cretaceous Period, 68 to 66 million years ago
Diplodocus
focused on eating vegetation
North America
Jurassic period
the boundary between carnivory and herbivory is in dinosaurs
the impressive range of diets found in living birds is a testament to the dietary diversity of their theropod ancestors
extinction of non-avian dinosaurs
impact event
10-kilometer wide asteroid or
extinct
dating of rock samples shows that non- dinosaurs went extinct at the same time as this event
formed the Crater in Mexico's Yucatan Peninsula
today partly buried
65.5-million-year-old layer deposited widely across the globe
high concentration of
a chemical only found in meteorites or nuclear blast sites
generated tsunamis
triggered earthquakes with magnitudes of over on the Richter Scale
debris that the explosion threw up, upon returning to earth encountered friction and started to up
raised Earth's surface temperature
firestorms likely caused a effect
dust in the atmosphere hindered photosynthesis in the short term
led to collapse of ecosystems
the site of impact over sulphate-rich deposits released sulfuric acid aerosols that acidified the oceans
reduced getting to Earth's surface
effected ocean ecosystem and food chains
the non-avian dinosaurs were either killed by the impact or died quickly in the extreme environment following it