Card Set Information
What three periods comprise the mesozoic?
Globally, what happens during the Mesozoic?
The break up of pangea although it doesnt start until the end of the triassic
What time period do the outcrops of North America come from?
Mainly the cretaceous, there are barely any from the jurassic or triassic
What are rift evaporites?
As pangea rifted, shallow warm seas flooded in and evaporites were formed extensively
What happens to the climate during the mesozic?
The continental climate gets cooler as Pangea splits up.
What is the Sonoma Orogeny?
a volcanic island arc hits the west of the United States in the beginning of the Triassic
What is the Chinle Formation?
Proves that Pangea was not completely desertous as these rocks werelayed down in very wet forrested areas. The petrified forest is part of this formation
When does East Coast rifting occur?
The end of the triassic
What caused the Pallisades?
Igneous activity from rifting
When was the Cordilleran Orogeny and where did it take place?
From tge Jurassic onwards, west coast
What is the Farallon plate?
An oceanic plate that was subducted under the west coast and caused the Cordilleran Orogeny
What are the Navajo Sandstones?
A jurassic deposit of desert sand dunes
What was the sundance sea?
A jurassic shallow sea that flooded the interior of North America
What is the Morrison formation?
Consists of deposits that were layed down in and around the sundance sea, famous for dino fossils. Jurassic in age.
Where is the Dinosaur National Monument?
On top of the Morrison formation
What was the Cretaceous interior seaway?
North American interior seaway caused by faster spreading rates of continents
What is special about the DFW cretaceous strata?
It shows the transgression and regression of the Interior seaway
What are coccoliths?
microscopic creatures that form chalk
What is special about the kimberly diamonds?
They were brought up as a result of volcanic activity associated with the breakup of pangea in South Africa
What was the Triassic Recovery?
The first third of the triassic when life recovered from the extinction event
When did dinosaurs evolve?
During the Triassic
How many extra holes do archosaurs have in their skull?
What was special about these archosaurs?
They had a vertical active posture
What type of blood did they appear to have?
What was the first known dinosaur?
How were the saurischians and ornothischians different?
They had different pelvic structures and saurichiands were mostly carnivours while ornothischians were mainly herbivores
Why were feathers origially evolved?
Insulation but later for ornamentation and attraction.
What did the evolution of feathers create?
What is the first known bird?
What were the pterosaurs?
They evolved in the triassic with a distinct anatomy for flight
What was special about the marine reptiles?
They evolved in the permian but increased in diversity during the mesozoic
When did the first true mammals evolve?
What was the first mammal?
What were angiosperms?
What was the first flowering plant?
When did the extinction event occur and what does it mark?
At the end of the cretaceous, the boundary between cretaceous and cenozoic
Where was the Chichulub crater and why is it significant?
The yucatan peninsula, significant because it seems to be where the meteorite struck that killed off 65% of life.
What were the Deccan Traps?
They were located in india and showed a huge outpouring of lava as well as poisonous gas.
What is the Shiva Crater?
A controversial crater that may be bigger that the chicxulub and may have actually helped with the extinction event