geologic time scale

What Era, period and Epoch are we in?

Cenozoic, quaternary y Holocene

What’s the order of the periods in Mesozoic

Triassic, Jurassic, Cretaceous

Cenozoic is the age of the what?

Mammals and humans

Mesozoic is the age of what?

Dinosaurs

Paleozoic is the age of the what?

Fish and the invertebrates

Precambrian is the time of what?

Bacteria, worms jellyfish anything that can’t creat a fossil

How did Mesozoic come to an end?

A mix of things but mostly a mediator

What is relative age

Facts that give you a understanding but nothing specific

What is absolute age?

the exact date/ time line

What Era is the longest

Precambrian

How old is earth?

4.6 billion

Age of Invertebrates?

Paleozoic

Age of fish?

Paleozoic

Age of Amphibians

Paleozoic

Age of mammals

Cenozoic

Age of Reptiles/Dinosaurs

Mesozoic

Precambrian time line?

4.6 bya -5.70 Mya

How much % does Precambrian cover over the geological time scale?

80%

What do scientists use to describe the sequence and length of changes in earths crust

The geologic time scale

What’s the purpose of geological time scale?

The geologic time scale outlines the development of earth and life on earth

In a geologic column were is the oldest rock located?

Bottom

What are 3 indicators do geologist use to divide the geological time scale

Earths surface, climate, and types of organism

What marks the end of the Mesozoic Era

Extinctions

Why is it difficult to divide Precambrian time into smaller time units

Very few fossils exist in early Precambrian

The era after Paleozoic era was the what era?

Mesozoic Era

Formation of the earth and moon was how many years ago?

4,600,000,000

What does trilobite mean

3 loaches bc there body is divided into 3 lobes

Are brachiopods alive today

Yes

What is the law of superstition identified as

The relative

Radiometric dating gives what?

Absolute dates

Why is geological time scale broken up into several periods of time?

Changes in biodiversity

What does Eras represent

An era groups dig periods that belong tg in its time line

What does Paleozoic mean

Ancient life

What does Mesozoic mean

Middle life

What does Cenozoic mean

Present life

What is the large land mass called

Pangea

The law of superposition allows us to determine what?

The relative ages of rock layers

Radiometric dating allows us to determine what?

Absolute age of rocks and fossils

What does the division of time in the geologic time scale represent

Major changes and events in Earths history