Formations
Which formation is the main record of Jurassic rocks in Boulder?
What is the Morrison Formation?
What is Boulder not famous for in the Morrison Formation?
What are dinosaur fossils (limited exposures)?
The age range of the Morrison Formation is?
What is 155–144 million years ago?
What was Boulder’s climate during the Jurassic?
What is hot, flat, and soggy?
During the Late Jurassic, what ocean was opening?
What is the Atlantic Ocean?
Which other formation partially records Jurassic rocks in north Boulder County?
What is the Sundance Formation?
The Morrison Formation sediments mainly came from which highlands?
What are the Elko Highlands in Utah?
The Sundance Formation is about how old?
What is 165–161 million years ago?
Which types of plants dominated Boulder during the Jurassic?
What are conifers, cycads, and ferns?
Which gulf began forming during the Late Jurassic?
What is the Gulf of Mexico?
Which formation in Boulder is sometimes considered part of the Morrison?
What is the Ralston Creek Formation?
Morrison Formation sediments formed in what kind of environment?
What is flat, humid areas with lakes and streams?
During the Early Jurassic, which supercontinent was ending?
What is Pangaea?
Were flowering plants present in Jurassic Boulder?
What is no, they had not evolved yet?
What formation’s sediments indicate that Boulder was relatively flat and soggy?
What is the Morrison Formation?
The Morrison Formation is known for what colorful features?
What are colorful layers and volcanic ash deposits?
The Morrison Formation contains what types of rock?
What are claystone, limestone, and sandstone?
During the Jurassic, Boulder was closer to which latitude?
What is 20°–35°N?
The Morrison Formation formed mostly in what type of environment?
What are streams, lakes, and humid lowlands?
Compared to today, was Boulder closer or farther from the equator during the Jurassic?
What is closer to the equator?
The Sundance Formation in Boulder contains what type of deposits?
What are terrestrial deposits (streams and windblown sand)?
The Sundance Formation is linked to what larger geologic event?
What are inland sea advances and retreats?
Transitioning to the next period, which period left a stronger rock record in Boulder?
What is the Cretaceous period?
By the Late Jurassic, what major geological changes were happening on the west coast?
What is mountain-building from subduction of the Pacific Plate?
The Morrison Formation environment shows that Boulder had mostly what type of landscape?
What are flat, humid, lake and stream-dominated lowlands?