During the Jurassic, the first birds evolved, but it is still difficult to determine which dinosaur represents the oldest bird. We once thought that Archeaopteryx was the first true bird, but now we think that Archeaopteryx was more of a glider and that the oldest true bird was actually a younger ancestor of Archeaopteryx.
Mammals only became large, diverse and dominant when dinosaurs declined in the late Cretaceous.
References: History of the Earth system: https://amzn.to/3v1Iy0G
GEO GIRL Website: https://www.geogirlscience.com/ (visit my website to see all my courses, purchase products, learn more about me, and donate to support the channel if you'd like!)
Are you studying for an exam? Schedule a tutoring with me: https://GEOGIRLTutoring.as.me/
Hello, Earth enthusiast! Check out my favorite planet-friendly products:
Bamboo toilet paper: https://shrsl.com/3cvku
Bamboo paper towel: https://shrsl.com/3cvkw
Compostable tableware: https://shrsl.com/3cvkz
Compostable trash bags: https://shrsl.com/3cvl0
Bamboo cutlery straw! : https://shrsl.com/3cwfl
Eco-friendly tote (great for shopping!): https://shrsl.com/3cwfp
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Non-textbook books I recommend:
Oxygen by D. Canfield: https://amzn.to/3gffbCL
Brief history of the Earth by A. Knoll: https://amzn.to/3w3hC1I
Life on a young planet by A. Knoll: https://amzn.to/2RBMpny
Some assembly required by N. Shubin: https://amzn.to/3w1Ezm2
Your inner fish by N. Shubin: https://amzn.to/3cpw3Wb
Oxygen by N. Lane: https://amzn.to/3z4FgwZ
Extraterrestrial Oceans by K. Hand: https://amzn.to/3clMx1l
The engines of life: https://amzn.to/3w1Nhke
Tools I use as a geologist/teacher/student:
Geology field notebook: https://amzn.to/3lb6dJf
Geological rock hammer: https://amzn.to/3DZw8MA
Geological compass: https://amzn.to/3hfbdLu
Geological lens: https://amzn.to/3jXysM5
Camera: https://amzn.to/3l6fGRT
Carbon neutral pencil case: https://shrsl.com/3cvjv
Carbon neutral backpack: https://shrsl.com/3cvkc
0:00 Triassic-Jurassic timing and events
1:47 Land plants of the Mesozoic
17:17 First mammals on Earth
6:41 First dinosaurs on Earth
8:11 The first crocodiles were closely related
9:08 a.m. Two large groups of dinosaurs
10:16 Were dinosaurs warm-blooded?
12:04 Pterosaurs were not dinosaurs
13:17 What was the first bird?
3:28 p.m. Mass extinction at the end of the Triassic
4:20 p.m. Videos and related references
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