History and process of formation of the earth's geology by theory advanced by experts is as follows:
1. Age Arkaekum. This period lasted approximately 2500 million years ago. Earth's crust is extremely hot and there was no sign of life.
2. Paleozoic era. This period lasted approximately 340 million years ago. At this time signs of life there, the little animals are invertebrates, fish, amphibians, and reptiles. This period is also called the primary era (the first time).
3. Mesozoic era. This period lasted approximately 140 million years ago. This period of life is growing, the number of species of fish, amphibians, reptiles and more. Examples of reptiles are still alive at this time is that dinosaurs and various bird species. This period is also referred to as secondary age (second) and the age of reptiles.
4. Age Neozoikum. This era lasted about 60 million years ago, which is further divided into two days, the Tertiary and Quaternary age.
Tertiary (Third Age). At this time, invertebrate animals, including mammals (mammals) evolve, otherwise extinct giant reptiles. Types of mammals that evolved during this time that primates. Animals Primates include lemurs, monkeys, apes, and monkeys-man.
Quaternary Period (Fourth Age). This period lasted roughly 600,000 years ago, consists of two days of the Pleistocene era (dilivium) and the Holocene era (alluvium). At the time of this Pleistocene temperature geothermal unstable. If the Earth's temperature is very high, then the ice melts on the surface of the earth so that the sea level rose. Conversely when the Earth's temperature drops sharply then the earth's surface filled with ice. These conditions affect the development of life on earth. This period is called the ice age. Pleistocene Period had several phases, namely phase early Pleistocene, middle, and end. Age after age Pleistocene Holocene era is ending. Holocene era lasted about 20,000 years ago and continues to this day. Intelligent human called Homo Sapiens began life at this time.
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