Division of Geological Time Flashcards
Is the time when new classes and orders of organisms have evolved to entirely different forms compared to those in the cambrian period
Ordovician Period
It was in this eon that Earth’s continental and oceanic crust began to solidify
Hadean Eon
The quaternary Period from 1.8 mya - present which includes Pleistocene to the recent time. Which is called
Holocene
In the ordovician period, characterized by their lack of jaw, being armored and having no fins
agnathans
Condwana moved to the Southern Hemisphere while the smaller continents almost converged at the Northern Hemisphere
Carboniferous Period
The end of Creteceous period marked the best-known mass extinction referred to as
K/T (Cretaceous-Tertiary) Extinction
This sudden explosion of living organisms during this period is referred as the Cambrian explosion
Cambrian Period
During this eon, Earth was molten planet
Hadean Eon
The scope of this was separated into eons, era, period, and epochs
Geologic Time
Periods in the Phanerozoic Era
Cambrian Period
Ordovician Period
Silurian Period
Devonian Period
Permian Period
Triassic Period
Jurassic Period
Cretaceous Period
formed a single world contingent called
Pangea
The Geologic Time was separated into
eons, era, period, and epochs
Anthracosaurs which appeared late in this period
Permian period
the evolution of the jawed and finned marine vertebrates called
gnathostomes
plants that are less than 10 centimeters high appeared
Silurian Period
multicellularity is evidenced by the fossils of diverse algae and soft-bodied invertebrates which either crawl or stood on the sea floor
Ediacaran Period
Small plants have pore- bearing structures called
Sporangia
How many mya did the deep freeze last in series of global ice ages
750 and 600 mya
The Phanerozoic Eon was divided into (era)
Paleozoic Era, Mesozoic Era, and Cenozoic Era
a marine reptile with a dolphin-like appearance
Ichthyosaurs
Synapsids gave rise to the therapsids called
mama- like reptiles
Pangea separated into two subcontinents
Laurasia at the Northern Hemisphere and Gondwana at the Southern Hemisphere
(mesozoic)
In the ordovician period, Marine mammals are either
epifaunal and infaunal
Began after the formation of the Earth’s crust, atmosphere, and seas
Archean Eon
lasted for about half a billion years, animals have existed and diversified on Earth after a deep freeze in series of global ice ages between 750 and 600 mya
Phanerozoic Eon
classified as either amphibians or reptile appeared
anthracosaurs
Geological Timeline: Eons
Hadean Eon
Archean Eon
Proterozoic Eon
Phanerozoic Eon
the different body plans of animals evolved about this time
blueprint
characterized by the accumulation of oxygen in the atmosphere
Proterozoic Eon
In the mesozoic era, there were two episodes of extinction called
end-permian mass extinction
the first known amniotes called
captorhinomorphs
record that depicts Earth’s history and the order of life forms from 2500 million years ago (mya) to the present
The Geologic Time Scale
The Cenozoic era, divided into
Paleogene period and Neogene period
These grazers and suspension feeders or scavengers are called the
Edicaran fauna
Mosses, liverworts, and tracheophytes evolved from the marine green algae called
Chlorophyta
