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Period: to
Alexander sousa Per.7
Geological timescale -
cretaous
5-First flowering plants appear-angiosperm
35-impact hypothesis-dinosaur mass extinction -
Jurassic
3-First flying reptiles called pterosaurs
13-Whoa those dinos are getting bigger and dominant on land-carnivores and herbivores have arrived. -
Triassic
16-Welcome to the world of dinos. Enter the squirrel sized dino and the first forest dwelling mammals
34-Ichthyosaurs are living in the ocean, new invertebrates appear. -
Permain
8-Appalachian Mountains are created because of the collision of tectonic plates.
38- Environmental change cause mass extinction of sea invertebrates -
Pennsayvanian
4-Giant cockroaches appear
15-coal deposits form -
miss
Early reptiles reassemble large reptiles -
Devonian
37-Age of fishes, fish that can breath out of water and spend time on land. -
Silurian
24- Eurypteriads, sea stars, and coral become more common
33- Vascular land,plants,and animals such as scorpions evolve on land -
Ordovician
1- There is very little plant life during this period
30- Colonies of tiny invertebrates called graptolites flourished and vertebrates appear,fish did not have jaws or teeth and their bodies were covered with bony plates -
Cambrian
22-Tribolites appear
23-Shelled brachiopods apear -
Precambrian
10-The presence of the Stomatolites indicate that shallow seas were dominant on Earth during those time intervals
11- Nearly half of the valuable minerals deposits in the world occur in the rocks of this period. -
Holocene
28-Modern humans developed agriculture and used tools made of iron and bronze.
19-The last glacier period ended and sea levels rose, Great lakes formed -
Pleistocene
20-Species that did not evolve to survive extreme cold moved to warmer climates areas or became extinct.
9-Homsapians appeared and are hunters. -
Pliocene
26-First modern horses appear
18-Various species migrated between continents across land bridges.
