End cretaceous mass extinction Flashcards
1
Q
hadrosaur vs sauropod teeth
A
hadrosaur: washboard teeth for grinding tough vegetation
sauropod: peg like teeth for nipping vegetation and swallowing
2
Q
what are angiosperm plants?
A
appear in early cretaceous; flowering seed plants: embryo develops in the protective ovary of the flower, double fertilization, reproductive cycle of a few weeks
3
Q
what do fossil nest sights and trackways tell us about dinosaur behavior and social structure?
A
- young reared in nests
- communal nesting sights suggesting seasonal breeding patterns and migration
4
Q
Walter and louis Alveraz
A
Walter - wanted to measure time on the KT (K/Pg) boundary
Louis Alvarez - knew to use the iridium to measure time
5
Q
what are the lines of evidence for extraterrestrial cause of the end cretaceous mass extinction?
A
- shocked quartz
- Microspherules (tektites)
- Irridium anomoly
- Yucatan crater
