A5 timeline featuring the history of Earth. Starts 600 mya to current, featuring all periods and eras, including conditions in these times, mass extinctions and insight into the evolution of the human eye through this time.
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A timeline indicating the evolutionary development of the eye in relation to environm
KEY 600 mya All sea creature
Cambrian
Life began with prokaryotic
Era these being jell
organisms. Further bacteria signs of eyes on
Pre-
created oxygen which Period sensitive eye sp
allowed for the creation of to see differen
new species such as Eye
Evolution accordingly.
invertebrates and eukaryotes
Extinction
570 mya Cambrian Explo
phytoplankton.
Ordovician Cambrian
Rapid appearances of many allowed exoske
new animal groups (and
predators). Large numbers of
invertebrates and trilobites. mya 544 mya
First vertebrates and Trilobites cont
calcified body parts appear in the f
and contain ma
505 mya mya They used thei
carcasses in th
The Great Biodiversification body parts wer
Event. Large amounts from their skin
geological changes. Land
plants such as algae/moss
(boost 02 causing ice age).
First fish appear
438 mya Ordovician Ma
extinction. Cau
435 mya
Palaeozoic Era
Land plants diversify and possible ice age
Silurian
animals became apparent on
land. Sea scorpions
dominated the ocean and
climate was warming again. mya Insects indepen
Fish were now jawed eye. These eye
work together
408 mya lead to a cleare
in avoiding pre
Devonian
The first insects, tetrapod, 400 mya Dragonflies hav
trees (forests) and primitive 29000 lenses.
vascular plants. Fish
dominate seas, first
appearance sharks
(jawed/armoured fish). mya Devonian Mas
365 mya by climate chan
360 mya armoured fish
Carboniferous
First reptiles. Amphibians
increased along with size of
insects. Plant increase, ferns mya Carboniferous
dominate land (rise in 02, together, mois
humid and warm climate). 305 mya humidity and t
Tetrapods have shelled eggs
due to necessity to travel Causes animals
inland and dry climate.
286 mya
mya Permian Mass
Reptile numbers increase
Permian
along with arid event. Caused
wastelands; hence eruptions (ash
amphibians decrease. First possible ice age
appearance of extinct. 70% lo
gymnosperms
Continents combined to
248 mya First carnivorou
binocular vision
form Pangea. The first 240 mya are a single len
Triassic
archosaurs, dinosaurs and Binocular vision
mammals evolved.
Gymnosperms, such as the 230 mya and distinguish
had a 55° binoc
cycad, were dominating
mya
ozoic Era
narrower snou
the land due to tough Prey had latera
conditions 213 mya 360° vision and
mya evolved from s
Explosion whic
Jurassic
Dinosaurs had evolved to 206 mya
traverse land, air and sea. eyes are seen i
First ‘true mammals’
which further diversified. Triassic Mass E
Appearance of birds extinct. Contin
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