Early Cultures Articles

• Ancient Civilizations
  Archaeology
  Anthropology
  Human Evolution
  Early Humans
  Origin of Life
   
  

  Castle

  A castle is a building, or set of buildings, fortified for defence against an enemy. The term is most often applied to a small self-contained ... > more
• Global Warming
  Oceanography
  Early Climate
  El Nino and La Nina
  Climate
  Geology
   
  

  Sequence stratigraphy

  Sequence stratigraphy is a relatively new branch of geology that attempts to link prehistoric sea-level changes to sedimentary deposits. The 'sequence' part of the name refers to cyclic sedimentary ... > more
• Frogs and Reptiles
  Zoology
  Animals
  Early Mammals
  New Species
  Endangered Animals
   
  

  Reptile

  Reptiles (also called 'herps') are tetrapods and amniotes, animals whose embryos are surrounded by an amniotic membrane. Reptiles were defined as the set of animals that includes crocodiles, ... > more
• Early Birds
  Dinosaurs
  Paleontology
  Fisheries
  Tyrannosaurus Rex
  Birds
   
  

  Feathered dinosaurs

  The realization that dinosaurs are closely related to birds raised the obvious possibility that some dinosaurs had feathers. Fossils of Archaeopteryx include well-preserved feathers, but it was not ... > more
• Fossils
  Paleontology
  Evolution
  Early Mammals
  Dinosaurs
  Charles Darwin
   
  

  Fossil

  Fossils are the mineralized or otherwise preserved remains or traces (such as footprints) of animals, plants, and other organisms. The totality of fossils and their placement in fossiliferous ... > more
• Dinosaurs
  Paleontology
  Fossils
  Early Birds
  Tyrannosaurus Rex
  Early Mammals
   
  

  Velociraptor

  Velociraptor is a genus of dromaeosaurid theropod dinosaur that existed approximately 83 to 70 million years ago during the later part of the Cretaceous Period. There is only one universally ... > more
• Extinction
  Endangered Animals
  Endangered Plants
  New Species
  Nature
  Exotic Species
   
  

  Extinction

  In biology and ecology, extinction is the cessation of existence of a species or group of taxa, reducing biodiversity. The moment of extinction is generally considered to be the death of the last ... > more
• Frogs and Reptiles
  Animals
  Wild Animals
  Fish
  Endangered Animals
  Extinction
   
  

  American Alligator

  The American Alligator has a large, slightly rounded body, with thick limbs, a broad head, and a very powerful tail. Males can weigh 500 lbs to over 1000 pounds; one American Alligator allegedly ... > more
• Frogs and Reptiles
  New Species
  Animals
  Fish
  Early Humans
  Biology
   

  Frog zoology

  About 400 million years ago, some members of the sarcopterygian group of fish moved onto land. These became the first amphibians. Today, these animals still spend part of their lives in water and ... > more
• Global Warming
  Climate
  Early Climate
  Ice Ages
  Fossils
  Environmental Issues
   
  

  Geologic temperature record

  This article is devoted to temperature changes in Earth's environment as determined from geologic evidence on multi-million to billion (109) year time scales. The last 3 million years have been ... > more

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