Geologic Time Scale

Question 1

A single eon covers a period of

Answer 1

half a billion years

Question 2

Paleozoic Era was ______________ years ago

Answer 2

554 million years

Question 3

Mesozoic Era was _____________ years ago

Answer 3

250 million

Question 4

Visible life where rapid expansion and evolution of life forms occur and fill the various ecological niches available on Earth.

Answer 4

Phanerozoic Eon

Question 5

Extinction of over 90% of living organisms including trilobites

Answer 5

Mesozoic Era

Question 6

6 Mass Extinction Events

Answer 6

• Late Ordovician Extinction Event
• Late Devonian Extinction Events
• Permian-Triassic Extinction Event
• Triassic-Jurassic Extinction Event
• Cretaceous-Paleogene Extinction Event
• (Holocene Extinction)

Question 7

66-65 mya

Answer 7

Paleocene

Question 8

It is the subdivision of eons. Spans a several Hundred Millions of years

Answer 8

Eras

Question 9

Time of Ancient life

Answer 9

Paleozoic

Question 10

Jurassic period lasted _________________

Answer 10

206-144 million yrs ago.

Question 11

6 major Periods of Paleozoic Era

Answer 11

• Cambrian
• Ordovician
• Silurian
• Devonian
• Carboniferous
• Permian

Question 12

Dominated by Sauropods (long necks and tails), and Theropods (bipedal carnivorous Dinosaurs). Feathered dinosaurs first appeared

Answer 12

Jurassic Period

Question 13

Geologists have divided Earth’s history into a ________________________________________ using significant events in the history of Earth.

Answer 13

series of time intervals

Question 14

Warm, moist climate conditions contributed to lush vegetation and dense swampy forests. Insects undergo rapid evolution led to such diverse forms of giant cockroaches and dragonflies.

Answer 14

Carboniferous Period

Question 15

the earliest well developed circulatory system (vascular plants) known as ______________ id found during Silurian Period

Answer 15

Cooksonia

Question 16

There were extensive shallow epicontinental seas and rocks that are less metamorphosed than Archean age

Answer 16

Proterozoic Eon

Question 17

Cenozoic era was ___________ years ago.

Answer 17

65 million years

Question 18

• Wooly Mammoths, Wooly Rhinoceros
• Saber tooth tigers
• Elephants
• H. Habilis
• H. erectus
• Other homo species

Answer 18

Pleistocene

Question 19

The two major groups of reptiles – diapsids and synapsids dominated this period.

Answer 19

Permian Period

Question 20

Paleogene Period Epochs

Answer 20

• Paleocene
• Eocene
• Oligocene

Question 21

Spans hundred million years

Answer 21

Periods

Question 22

This period brought the emergence of terrestrial life

Answer 22

Silurian

Question 23

2.5 mya- 12 kya

Answer 23

Pleistocene

Question 24

As plants move ashore so did other terrestrial organisms. Air-breathing scorpions and millipedes were common during the period.

Answer 24

Silurian period

Question 25

Extinction of dinosaurs and many other organisms.

Answer 25

Cenozoic Era

Question 26

Spans ten million of years.

Answer 26

Epochs

Question 27

Dominated by the dinosaurs (duck billed & horned). Tyrannosaurus Rex is found during this period.

Answer 27

Cretaceous Period

Question 28

First appearance of organisms with hard parts.

Answer 28

Paleozoic Era

Question 29

- Ancestral Bats - Ancestral Elephants - Cetaceans and Sirenians - Eohippus (first horse) - Perissodactyls (odd-toed) - Artiodactyls (Even-toed)

Answer 29

Eocene

Question 30

- Rodents - Condylarths - Primates - First Hare/ Rabbits - Creodonts (catlike & doglike animals)

Answer 30

Paleocene

Question 31

Largest intervals of geologic time.

Answer 31

Eons

Question 32

Age of Dinosaurs & Age of Conifers

Answer 32

Mesozoic Era

Question 33

Diapsids gave rise to the

Answer 33

Dinosaurs

Question 34

33-23 mya

Answer 34

Oligocene

Question 35

This period was known as the “age of fishes”.

Answer 35

Devonian Period

Question 36

The environment was dominated by the therapsids (mammal-like reptiles) and Thecodonts (ancestors of dinosaur)

Answer 36

Triassic Period

Question 37

Time of Middle Life

Answer 37

Mesozoic

Question 38

Sharks, fishes and marine Reptiles

Answer 38

Triassic Period

Question 39

They developed during Devonian Period

Answer 39

Sharks and bony fishes

Question 40

Age of mammals

Answer 40

Cenozoic Era

Question 41

Age of reptiles

Answer 41

Mesozoic Era

Question 42

Period where life was first formed on earth (Archean & Bacteria)

Answer 42

Archean Eon

Question 43

Periods during Mesozoic Era

Answer 43

- Triassic - Jurassic - Cretaceous

Question 44

Cretaceous Period lasted _____________.

Answer 44

144-65 million years ago.

Question 45

a system of chronological measurement that relates stratigraphy to time. It is used by geologists to describe the timing and relationships between events that have occurred throughout Earth’s history.

Answer 45

Geologic Time Scale

Question 46

12 kya- present

Answer 46

Holocene

Question 47

55-34 mya

Answer 47

Eocene

Question 48

Almost all marine organisms came into existence as evidenced by abundant fossils.

Answer 48

Cambrian Perios

Question 49

- Mesohippus and Miohippus - Mastodons (Mammoth ancestors) - Parapithecus (New World Monkeys) - Indricotherium (Largest mammal)

Answer 49

Oligocene

Question 50

Just before proliferation of complex life on Earth.

Answer 50

Proterozoic Eon

Question 51

_________________ have distinction of occurring at the highest elevation on Earth – the top of Mount Everest.

Answer 51

Ordovician Rocks

Question 52

Earth cooled down and was able to support continents and oceans.

Answer 52

Archean Eon

Question 53

Specific Event happened in Paleozoic Era

Answer 53

The Cambrian Explosion

Question 54

This period marked the earliest appearance of vertebrates and the jawless fish known as Agnatha

Answer 54

Ordovician

Question 55

Time of recent life

Answer 55

Cenozoic

Question 56

Gymnosperms, cycadeoids, cycads, gingkoes, conifers

Answer 56

Triassic Period

Question 57

Lowland forests of seed ferns, scale trees and true ferns flourished.

Answer 57

Devonian Period

Question 58

Important event in Cambrian Period is the ability of organisms to secrete ____________________ and __________________ for formation of _________

Answer 58

calcium carbonate and calcium phosphate, shell

Question 59

Synapsids gave rise to

Answer 59

Mammals

Question 60

Neogene Period Epochs

Answer 60

Miocene, Pliocene, Holocene