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geology 106 chapter 22A Kristie Cornell
Terms in this set (53)
middle life (245-144 million years ago); rise of mammals and dinosaurs; the rise of birds; extinction of dinosaurs, rise of flowering plants
order of the Eons in the Mesozoic Era
dominant life form on earth in the mesozoic
-isolation of life
what did the breakup of pangaea influence?
Laurasia and Gondwana
What part of Pangaea started to breakup in the Triassic
on what mountain trend did Pangaea start rifting?
What part of Pangaea started to breakup in the Jurassic?
Gulf of Mexico
What body of water started forming in the Jurassic?
South America and Africa
What part of Pangaea started to break up in the Cretaceous?
point where three plate boundaries intersect
water gets into the rifts but is very shallow
how were the large areas of evaporites made?
the single, large ocean that covered Earth's surface during the time the supercontinent Pangaea existed
what was the climate during Pangaea?
a climate region that forms on the side of a mountain range sheltered from the prevailing winds
-warms up the air
what does the break up of Pangaea do to the climate?
the crust relaxes and extends causing faulting
A wide seaway that existed in western North America during the Middle Jurassic Period
passive continental margin
what does rifting produce?
a lowland between mountains
poorly sorted red non-marine sediments with interbedded basalt
a fault in which the hanging wall moves down relative to the footwall
a fault in which the hanging wall moves up relative to the footwall
a reverse fault in which the hanging wall slides over to the foot wall.
a type of fault where rocks on either side move past each other sideways with little up or down motion
Diverging plate boundaries
where do normal faults occur?
what are the terrestrial conditions of the Newark Group?
Newark Group Volcanism
Fissure volcanism with ash deposit
Widespread volcanic activity breakup of Pangaea
release of tons of CO2 due to high volcanic activity
What may have caused the mass extinction at the end of the Triassic?
A depression in the floor of the ocean in which the water circulation is topographically restricted and therefore generally is oxygen-depleted
How much of the US does the Mississippi River drain?
domelike rock structure that is formed beneath the earth's surface by the upward movement of a mass of salt
What natural substance can be found near salt domes
rifting caused increased heat flow which caused transgression
What caused the major flooding in cretaceous?
A period of deformation affecting the western part of North America from Jurassic to Early Cenozoic time;
Cretaceous Interior Seaway
A Late Cretaceous arm of the sea that effectively divided North America into two large landmasses
a cone-shaped extinct bivalve mollusk that formed colonies resembling reefs in the Cretaceous period.
microscopic algae with calcium carbonate shells, form the base of many marine food webs
tiny crystals of calcium carbonate
what is chalk made out of?
Triassic orogeny caused by the collision of an island arc with the southwestern margin of North America
mixture of loose sedimants forming along the accretionary wedge
a large wedge-shaped mass of sediment that accumulates in subduction zones; Here sediment is scraped from the subducting oceanic plate and accreted to the overriding crustal block
Great Valley Group
thick sequence of multiple types of sediments
Sierra Nevada Batholith
Remnant of part of continental volcanic arc
volcanics will be close to the trench
steep subduction angle
volcanics will be far away from the trench
shallow subduction angle
which crust will subduct first?
A mountain-building event that affected western North America a result of convergent margin tectonism; a fold-thrust belt formed during this event.
The mountain-building event in western North America; in the United States, it formed the Rocky Mountains as a result of basement uplift and the warping of the younger overlying strata into large monoclines.
famed for its cross-bedding that developed as sand dunes migrated on the shores of an ancient shallow sea.
formed in early jurassic period of mesozoic era
Red, continentally derived rocks of the Triassic. Common rocks of the Colorado Plateau. Well exposed in the Painted Desert and the Petrified Forest.
rocks in early triassic
marine sandstones, shales, and limestone
-regression of the sundance sea
-70 species of dinosaurs
-most famous in north america
Accretion of Terranes
a feature of a subducting plate that is too large to be subducted so it gets tacked onto the land mass
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