J West geological timeline

J West period 3

Period: Jan 1, 2016 to Jul 1, 2017

geological timescale

Precambrian era (4,600 ma years ago)

Jan 17, 2016

1. The presence of stromatolites indicates that shallow seas covered much of the earth during intervals in this period. 11 Nearly half of the valuable mineral deposits in the world occur in the rocks of this period

Cambrian period (542 ma years ago)

Feb 17, 2016

1. Trilobites appear 23 Shelled brachiopods appear.

Ordovician period (488 ma years ago)

Mar 17, 2016

1 there is very little plant life 30 colonies of tiny invertebrates call graptolites flourished and vertebrates appear

Silurian period (444 ma years ago)

Apr 17, 2016

33 vascular land plant and animals 24 eurypterids sea tars and coral become more common

Devonian (416 ma years ago)

May 17, 2016

31 huge plants begin to develop early amphibians form 37 ages of fishes fish that can breath out of water and spend time on land form

mississippi period (359 ma years ago)

Jun 17, 2016

2 swamps and forest cover the land. 21 early reptiles resembling large lizards appear

pennsylvanian period (318 ma years ago)

Jul 17, 2016

4 giant cockroaches appear 15 coal deposits form

permian period (299 ma years ago)

Aug 17, 2016

8 Appalachian mountains are created because of the collisions of tectonic plates and savannah forms. 38 environments change causes mass extinction of sea invertebrates

triassic period (251 ma years ago)

Sep 17, 2016

16 welcome to the world of dinosaurs! enter the squirrel sized dinosaurs & the fish forest dwelling mammals appear. 34 ichthyosaurs are living in the ocean, new invertebrates call ammonite develop

jurassic period (200 ma years ago)

Oct 17, 2016

13 whoa those dinos are getting big and dominate the land - lizard-hipped and bird- hipped appear carnivores and herbivores have arrived. 3 Flying reptiles called pterosaurs are in the air now.

Cretaceous Period (146 ma years ago)

Nov 17, 2016

35 Impact hypothesis dinosaurs mass extinction. 5 First flowering plants appear - angiosperm

Holocene Epoch (.0115 years ago)

Nov 17, 2016

19 the last glacial period ended and sea levels rose, the great lakes formed 28 Modern human developed agriculture and used tools made of bronze and iron.

Paleocene Epoch (65.5 ma years ago)

Dec 17, 2016

12 First primates evolve. 29 small rodents evolve

Eocene Epoch (55.8 years ago)

Jan 17, 2017

17 Flying squirrels, whales and bats appear. 25 World wide temperature drops about 4 degrees celsius (39.2 degrees fahrenheit)

Oligocene

Feb 17, 2017

27 Many early mammal become extinct, clams and snails flourish 32 antarctic icecaps begin to form.

Miocene Epoch ( 23.0 ma years ago)

Mar 17, 2017

32 Antarctic ice caps begin to form 36 Mediterranean sea dries up and refills several times due to plate tectonic forces and dropping sea levels.

Pliocene Epoch ( 5.3 ma years ago)

Apr 17, 2017

18 various species migrated between continents across land bridges. 26 First modern horses appear.

Pleistocene Epoch (1.8 ma years ago)

May 17, 2017

9 Homosapien (modern humans) appeared & and hunters 20 species that did not evolve to survive extreme cold moves to warmer climates areas or became extinct

Anthropocene Epoch ( Modern Day)

Jul 17, 2017

7 some scientist believe that human kind has caused mass extinctions of plants and animal species, polluted the oceans and altered the atmospheres. 14 there is argument as to when this epoch began, somen scientist think it began with the industrial age in the early 1800s others thin it began with the atomic age in the 1950s