What is the Morrison Formation?

Author: Leandro Alegsa

Q: What is the Morrison Formation?


A: The Morrison Formation is a geological formation laid down in the Upper Jurassic, located in the western United States and named after Morrison, Colorado.

Q: What type of rock does it contain?


A: The Morrison Formation contains mudstone, sandstone, siltstone and limestone.

Q: What color is it?


A: The colour of the Morrison Formation is light grey, greenish gray, or red.

Q: Where are most fossils found within this formation?


A: Most of the fossils occur in the green siltstone beds and lower sandstones of the Morrison Formation.

Q: When was this formation created?


A: The Morrison Formation was created during the Upper Jurassic period.

Q: Why is it called "Morrison"?


A: It is called "Morrison" because it was first discovered near a town called Morrison in Colorado.

Q: What makes this formation so important for dinosaur fossil discoveries?



A: This formation has been very fruitful for dinosaur fossil discoveries due to its sedimentary rock composition which preserves fossils from rivers and floodplains from millions of years ago.


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