exposed precambrian rock
Mesozoic Era
That lasted from 251 million to 65.5 million years ago,divided into three periods, the Triassic, the Jurassic, and the Cretaceous. The Dinosaurs were in this era
The process or change by which new species develop from prexisting species over time
Geologic Column
an ordered arrangement of rock layers that is based on the relative ages of the rock and in which the oldest rocks at the bottom
Precambrian Time
the interval of time in the geologic time scale from earths formation to the beginning of the Palezoic era, from 4.6 billion from 542 million years ago. which is divided into the Archean and Proterozoic, primitive forms of life first appeared on Earth.
Mass extinction
large numbers of species become extinct
impact hypothesis
explanation of why the dinosaurs became extinct
Paleozoic Era
The geologic era that followed Precambrian time and that lasted from 542 million to 251 million years ago
Geologic Time scale
describe the timing and relationships between events that have occurred throughout Earth’s history.
Cenozoic Era
65.6 mya the age of mammals
What Epoch began, 5.3 million years ago? What does 5.3 Ma stand for?
Pliocne, 5.3 million years ago
The Precambrian time contained very few
What was hard to determine with only a few fossils
What happened during that time, The Precambrian Rock Record
What helped the Developement of new life forms during the first Paleozoic Era
Warm shallowed sea covered most the continents
What is the most common Precambrian Fossil?
What time period did the Ichthyostega Amphibians appear during the Paleozoic Era?
The Devonian Period
What time period was marked by a massive by a massive extinction of orgainisms during the Palezoic Era
The Permian Period
Describe The ankylosaur dinosaur from the Cretaceous period
armored and horned
What caused new mammal species to develop after the ice ages of the Cenozoic period
Climate change, advancing and retreading ice sheets
What is known about the rocks on the bottom of a geologic time scale?
they are the oldest
What would you assume about the age of a rock layer that you found a dinosaur bone in?
could have formed 251 million years to 146 million years ago during the Mesozoic Era
What are the two hypotheses that led to the Cretaceous-Tertiary mass extinction.
That the extinction was caused by enviornmental changes resulting from movement of continents & increased volcanic activity, that about 65 Mya an asteroid crashed into earth. The impact of Collison raised enough dust to block out the suns rays for many years.
Describe what scientists used to divide the geologic column into different layers
Scientists determine the relative age of sediementary rock in different areas around the world No single area on earth continued a record of all geologic time some sort of change.
Choose a time period and describe what changes occured in life and what changes occurred to earth.
Mesozoic Era

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