Flora & Fauna
Dinosaurs evolved into this early lifeform.
What are the first birds?
This geological activity is primarily caused by the interplay of tectonic forces.
What is Growth faulting?
The temperature difference at this time would be this much for the poles compared to the equator.
How much is half?
This element, rare on Earth but more abundant in space debris, is found in the thin boundary between the Cretaceous and Paleogene.
What is iridium?
These early species became the ancestors of nearly all living mammals today.
What are marsupials and/or placentals?
This is a ancient continental shelf that was submerged underwater during different geological periods, which often emerge during periods of sea level changes.
Neither of the poles has this during the Cretaceous.
What is ice?
A prominent example of the iridium line can be found near this Colorado city.
What is Golden?
During the Cretaceous, this dinosaur ruled.
What is the T-Rex?
Horst and Graben are usually found in these positions.
What is stationary and subsided? (And a description of the Horst and Graben position that is correct counts.)
This geological evidence supports the idea of an arid climate.
What are evaporites?
This percentage of life was estimated to have died during the Cretaceous-Paleogene Mass Extinction.
What is 75%/What is three-quarters?
These plants covered most of the Cretaceous period.
What is moss and mushrooms?
This orogeny took advantage of pre-existing faults that were made during the Ancestral rocky mountains orogeny.
What is the Laramide orogeny?
The Cretaceous was estimated to be about this many degrees warmer than our current day.
How many is 6 to 14?
This asteroid triggered the Cretaceous-Paleogene Mass Extinction.
What is the Chicxulub asteroid/What is Chicxulub?
During the Cretaceous, this plant life became the dominant plant life.
What are flowering plants?
This orogeny took advantage of the bedding in overlaying Paleozoic sedimentary rock.
What is the Sevier orogeny?
These two rocks are evidence toward a humid midlatitudes climate.
What are bauxite and laterite?
Also known as the iridium line, this layer marks the boundary between the Mesozoic and Cenozoic eras.
What is the K-Pg Boundary, What is the Cretaceous-Paleogene Boundary, What is the K-T Boundary, What is the Cretaceous-Tertiary Boundary?