Paleo and preca

• Precambrian Era


  A predated era prior to the emergence of life during the Cambrian Period
• Divisions of the Precambrian Era

  • Hadean
  • Archaean
  • Proterozoic
• Earth's Condition During Precambrian Era

  1. Hadean: Earth's surface was in the form of liquid rock and boiling sulfur that built an ocean of hot materials

  2. Archaean: Earth's interior was still hot and active and this caused a series of volcanic eruptions. This formed long chains of small islands. The continents have not formed yet during this time

  3. Proterozoic: Earth was suspected to have two supercontinents: one was located in the equator and the other one was situated on the other side

  
• Paleozoic Era

  Spanned around 300 million years, which was almost half of the entire Phanerozoic. During this time, there were six major continental landmasses

  
• Paleozoic Era

  At the start of this era, the world-continent Pannotia was broken into pieces leading to the formation of Pangea that makes Earth's continents connected once again
• Pannotia


  A Neoproterozoic supercontinent that may have existed during the Ediacaran period (~600 mya), to the end of the Precambrian (about 541 mya). After that, it split into smaller continents
• Pangaea

  About 200 million years ago, all the continents on Earth were actually one huge "supercontinent" surrounded by one enormous ocean. This gigantic continent slowly broke apart and spread out to form the continents we know today
• The Paleozoic is mainly characterized by the explosion of different life forms that started to emerge on Earth

  
• Divisions of the Paleozoic

  • Cambrian
  • Ordovician
  • Silurian
  • Devonian
  • Carboniferous
  • Permian
• Paleozoic Era

  1. Cambrian: The explosion of life occurred

  2. Ordovician: Dominant animals were marine invertebrates such as trilobites and corals

  3. Silurian: It is marked by the first appearance of land plants

  4. Devonian: It is also known as the Age of Fishes

  5. Carboniferous: First seed plants and first reptiles appeared

  6. Permian: It is marked by the extinction of 90% of Earth's species

  
• Ediacarans


  Appeared in the fossil record that was dated almost 600 million years ago

  
• Ediacaran biota


  A taxonomic period classification that consists of all life forms that were present on Earth during the Ediacaran Period
• Dickinsonia


  • One of the important Ediacarans that resembles a ribbed doormat
• Vertebrates first appeared 525 million years ago during the Cambrian explosion
• Trilobites


  • Were the dominant species during the Cambrian period. These organisms are extinct groups of arthropods
• Crinoids, echinoderms, brachiopods, graptolites, and rugose corals

  • Dominated the Silurian to the Permian period

  
• Primitive tetrapods


  • Emerged eventually
• The Precambrian Era has three major subdivisions: Hadean, Archean, and Proterozoic. Today, it is known that life on Earth started during the early Archean, thus making fossilized organisms increase throughout the Precambrian time period.

  
• The Paleozoic is divided into six periods: the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian. These names were derived from original locations where fossilized rocks of these ages were found.

  
• During this period, single-cell and multicellular organisms started to emerge. The first multicellular animals, also known as Ediacarans, appeared in the fossil record that was dated almost 600 million years ago.
• The most advanced form of animals such as the vertebrates or animals with backbones first appeared 525 million years ago during the Cambrian explosion.
• Most phyla of the modern times were present during the Cambrian but trilobites, brachiopods, mollusks, hyolithids, and archaeocyathids were the most abundant.

  
• The Cambrian explosion led to the emergence of various phyla of organisms.