-
Precambrian
34- new invertebrates
11-nearly half of the valuable mineral deposit -
Period: to
A Rodriguez P1
Geological Timescale -
cambrian
23- shelled brachipods
22- trilobites appear -
ordovician period
30- fish did not have jaws or teeth and their bodies were covered with bony plates
1- very little plant life -
silurian period
24- sea stars and coral become more common
33- scorpion begin to evolve -
carboniferous period
2- swamps and forest cover the land
4- giant cockroaches appear -
Devonian period
31- huge plants begin to develop, early amphibians form
37- fish that can breathe out of the water -
permian period
38- trilobites and eurypterids as the seas retreat
8- appalachian mountain are created because of the collision of tectonic plates and savannah form -
triassic period
16-welcome to the world of the dinosaur
29-small rodents evolve -
jurassic period
3- flying reptiles called pterosaurs are in the air now
13- carnivores and herbivores have arrived. -
cretaceous period
5- first flowering plants appear
35- dinosaurs mass extinction -
Tertiary Period
7- polluted the oceans and altered the atmosphere
32- antaric icecaps begin to form -
paleocene period
12- first primates evolve
17- flying squirrels,whale, bats appear -
Eocene period
12- first primates evolve
17- flying squirrels,bats, whales appear
same as paleocene -
oligocene
6- himalays develop due to uplifting
26- first modern horses appear -
milocene
6- subcontinent and eurasian contents colliding
27- many early mammal become extinct -
pilocene
18- various species
26- modern horses -
pleistocene period
20- dire wolf and giant ground sloth
9- modern humans -
holocene
19- great lakes formed
28- used tools made of bronze and iron -
anthropocene period
10- covered much of earth during intervals
14- argument as to when this begin
