... longest geologic era,
lasted about 4 billion years
• No fossil record – WHY?
a. Most rocks were non-sedimentary
because the earth was still cooling
b. Small organisms with no hard shells
A Brief Look at Earth`s History
... Climate was much warmer than today.
Shallow seas covered much of North America.
Atlantic Ocean formed.
North America and Africa moved apart.
Pangaea began to break up.
Land became drier.
Basins were larger so water drained into them.
Ural and Appalachian Mountains formed.
Continents moved together, ...
Patterns of evolution
... Scientist believe that there are more fossils
to be found around the time of mass
extinctions than any other time.
Geologic Time Scale Study Guide
... Put the following eras in order from earliest to current: Precambrian, Cenozoic,
Precambrian, Paleozoic, Mesozoic, Cenozoic
Put the following periods in order from earliest to current: Cretaceous, Ordovician,
Geologic Time Webquest - Peoria Public Schools
... End of this period marked by the largest what?
What kind of plants are on the scene at this time?
Define this type of plant
What evolutionary innovation occurred here?
Why is this important?
What do we find large deposits of during this time period?
Devonian, What three types of plants ...
... – Early: fishes, aquatic vertebrates, ferns
– Middle: amphibians
– Late: reptiles and mass extinction
– Cambrian Period: oceans teemed with many
types of animals, including worms, sea stars,
and unusual arthropods
Extinction Event www.AssignmentPoint.com An extinction (level
... The age of the Earth is about 4.54 billion years old. The earliest
undisputed evidence of life on Earth dates at least from 3.5 billion
years ago, during the Eoarchean Era after a geological crust started to
solidify following the earlier molten Hadean Eon. There are microbial
mat fossils found in 3 ...
... There are two theories as to the domino effect of Devonian Extinctions…
Both based on the idea that expanding erogenous plants decreased the
amount of Carbon Dioxide in the atmosphere, leading to a cooling planet, and
eventually, glaciation of the Southern Pole.
Earth: An Ever changing planet
... Eons – Millions and Billions of years
• Haden: Earth before life evolved
4.6 to 3.5 Billion years ago (13% of Earth’s history)
• Achaean: Earth with only bacteria like cells
3.5 to 2.5 Billion years ago (28% of Earth’s history)
• Proterozoic: Multicellular life forms
2.5 BYA to 540 MYA (48% of Eart ...
13.3 Mesozoic Era: Age of Reptiles
Several important new types of
organisms evolved during the
Triassic. For example, the first
dinosaurs were among the many
types of reptiles that evolved.
Part 2 - Mahopac Voyagers!
... A) appeared during the Cambrian Period
B) Late Cretaceous Period
B) became index fossils
C) Early Jurassic Period
C) have become extinct
D) Early Proterozoic Era
D) lived on land
____21. Which event occurred at the start of the Mesozoic Era?
____17. From the study of fossils, what can be inferred ab ...
Ch. 14-Life History Lecture #1
... A. Earth’s formation
C. 1.8 BYA eukaryotes
D. 87% of Earth’s history
fundamentals of earth history
... B. Ancestor of Earliest Mammals = Cynodonts (Reptile); Triassic
C. Patterns of Life in the Mesozoic
1. Triassic - seasonal climates; deposit feeders dominate
2. Jurassic & Early Cretaceous - more stable climates; more
3. Middle Cretaceous - most stable climates; diverse suspension ...
Earth: An Ever changing planet
... Cambrian - Permian period:540 MYA – 248 MYA
• Cambrian: Starts with a burst of new
life forms & all life in ocean
• Plants & animals evolved from simple
seaweed & sponges
• to fish in the oceans & insects,
amphibians, and early reptiles on land
• 1 Mass extinction in the ocean
• Nov. 17 – Dec 6
... activity. We know from recent volcano eruptions that large eruptions can cause the
temperature to drop all around the world.
The Permian Period gets its name from a region of west-central Russia called Perm
Oblast. This is where rocks from this time were first found. Even though it was first
found i ...
Geologic Time PowerPoint
... 2.Trilobites and brachiopods are abundant.
3.In the Ordovician period, there are many
changes in sea level and tectonics continues to
move continents and make mountains. First
jawless fish are in the seas.
4.Silurian period- First plants began to grow on
land and jawed fish evolve.
1. Scientific evidence indicates that the concentration of oxygen in
... d. 12.5 billion
The division of Earth history into geologic periods is based on major geologic and paleontologic
events. Once such event was the impact of an asteroid off the coast of Mexico during the end of
the Cretaceous Era. What was the result of this event?
a. Global cooling that led ...
Name______________________ due date ______ period
... 8. Which era is the oldest?_________________________________________________________
9. In which era did dinosaurs become extinct? ___________________________________________
10. In which era did the great extinction on earth take place? _______________________________
11. Which statement best expla ...
... 9. When
The Phanerozoic /ˌfænərɵˈzoʊɪk/ (British English Phanærozoic) is the current geologic eon in the geologic time scale, and the one during which abundant animal and plant life has existed. It covers 541.0 ± 1.0 million years and goes back to the period when diverse hard-shelled animals first appeared. Its name derives from the Ancient Greek words φανερός (fanerós) and ζωή (zo̱í̱), meaning visible life, since it was once believed that life began in the Cambrian, the first period of this eon. The time before the Phanerozoic, called the Precambrian supereon, is now divided into the Hadean, Archaean and Proterozoic eons. Plant life also appeared from early in the Phanerozoic eon.The time span of the Phanerozoic includes the rapid emergence of a number of animal phyla; the evolution of these phyla into diverse forms; the emergence and development of complex plants; the evolution of fish; the emergence of insects and tetrapods; and the development of modern faunas. During this time span tectonic forces caused the continents to move and eventually collect into a single landmass known as Pangaea, which then separated into the current continental landmasses.