Types of critters
What makes something an invertebrate
No spine
What is relative age
Age of rocks compared to other rocks around it
What period was known for Pangaea forming and the mass extinction.
Permian period
Triassic
This period happened roughly 66 million years ago
Paleogene
what makes something a reptile
has scales and lays eggs
What is absolute age
The number of years that have passed since the rock formed
This period happened roughly 485 million years ago
Ordovician period
This period happened roughly 201 million years ago
Jurassic
mammals begin to truly flourish in this era
Paleogene
What is an Era
What percent of things have to die to be a mass extinction
80%
This period is the "age of the fish"
Devonian Period
This period happened roughly 145 million years ago
Cretaceous period
Oops ice age happens leading to peoples take over
Quarternary period
What is a period
A piece of an era that has very similar characteristics
What is an index fossil
A fossil use to determine the relative age of other rocks
Carboniferous
Known for birds replacing the flying reptiles
Cretaceous period
in this period some of the mammals and birds get huuuuuuuge
Neogene
What is a mammal (need all 4 things)
Back bone, hair, has milk, warm blooded
What is the Precambrian Era
The first signs of life with single cell and multi celled organisms
Known for its "explosion of life"
Cambrian
First period where dinosaurs become common
Jurassic
This period happened roughly 2 and half million years ago
Quarternary