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-Guide fossil: Stromatolites
-Origin and early evolution of the Earth
-Reducing atmosphere to oxizing atmosphere
-Oceanic environment -
First microscopic life forms similars to bacterias. Cell structure, lacking of nucleus. Marine environment. First eukaryotic and prokaryotic forms of life. -
Related to de rise in oxygen. Eukaryotic cells and multicellular organisms appear. Marine environment. -
Multicellular algae and invertebrates develop. Marine and land environment. Arthropods, such as trilobites. In this era the main groups of animals present today appears. -
-Guide fossil: Trilobites
-Big orogenies and volcanisms
-Warm climate
-Oceanic and land environment -
The fish develop and colonization of the mainland begins with the gymnosperm plants. Then the jawed fish formed -
Warm and humid climate favors the development of swampy expanses and the irruption of large coniferous and ferns forests -
Amphibians appears, colonize the aquatic and terrestrial environment. These amphibians lobed lungs and fins that supported the body -
-Guide fossil: Ammonites
-Meteorite impact
-Warm and dry climate and low sea level
-Oceanic and land environment -
Large reptiles, like the dinosaurs colonize both terrestrial and aquatic environments. Dinosaurs were reptiles with backbones that had four legs: the front legs shorter than the back ones -
Plants experiment a great diversification especially conifers and angiosperms, flowering plants. They have roots, stems and leaves and their flowers were very showy. They are characteristic of land areas, located near water -
Diversification of birds that develop through carnivorous dinosaurs
Its bones were light, its legs were long, and its body was covered with feathers of various kinds, especially the ones from its arms, which were long and overlapping. They dominated the land and especially the air environment. -
-Guide fossil: Nummulites, sea origin
-Complete development of the Alpine orogeny
-Glacial and interglacial periods
-Oceanic and land environment -
2.6 million of years ago. Remains of the genus homo. They are primates adapted to terrestrial life, to walk upright in a bipedal posture, with the skull also vertical. -
195,000 years ago. Hands and feet with five fingers, plantigrade feet, opposable thumb on hands and feet, clavicles presents, flat nails instead of claws, color vision...