Fossils and Geological Eras

The Pleistocene is the geological epoch,  which lasted from about 2,588,000 to 11,700 years ago, spanning the world's recent period of repeated glaciations. Methane production in eastern Siberian lakes is controlled by organic matter,  which accumulated during the Pleistocene.

The earliest life forms on Earth originated in water approximately 3.5 to 4 billion years ago. The primordial oceans provided the essential conditions for life to develop, including protection from harmful ultraviolet radiation, a stable medium for chemical reactions, and the necessary organic compounds. Water-based environments supported the formation of simple single-celled organisms before life eventually adapted to terrestrial environments. This is supported by the fossil record and our understanding of early Earth conditions.

The gymnosperms originated in the late Carboniferous period. This appears to have been the result of a whole genome duplication event around 319 million years ago.

Red Data Books (Red List) are maintained by IUCN to document threatened species globally. They include both plants and animals at risk of extinction, not just one category. 'Extinct animals only' and 'endangered plants only' are too narrow, and 'fossil plants' refers to extinct species already preserved as fossils.

The Coenozoic era is the present era and is also known as the ‘Age of mammals’, the era dominated by the mammals.

Carboniferous period marked the formation of coral beds.

The earth originated during this time period.

Paleontology is the scientific study of fossils. Organic evolution is the process. Palaeogeography studies ancient geography. Herpetology studies reptiles and amphibians. Fossils provide crucial evidence for evolution and help reconstruct ancient life forms and environments.

 The dinosaurs and the mammals appeared during the Triassic period, roughly 225 million years ago. The dinosaurs went extinct 65 million years ago. The Mesozoic Era lasted about 180 million years, and is divided into three periods, the Triassic, the Jurassic and the Cretaceous.

The earliest evidence of land plants dates to the Ordovician period (485-444 million years ago), which is part of the Paleozoic era. This marks the transition from aquatic to terrestrial plant life.

Paleontology is the scientific study of fossils and what they reveal about ancient life forms, their evolution, and Earth's geological history. The word itself derives from Greek meaning 'ancient being study'.

Teeth are the most durable part of vertebrate remains due to their high mineral content (enamel and dentine). Unlike soft organs like heart, skin, or liver, teeth resist decay and fossilize readily.

Eocene epoch was the warmest period during cenozoic era.

Permian period represents ‘Age of Amphibians’, well dominated by various amphibians.

 The ‘Age of trilobites’ has been attributed to the Cambrian period. The Cambrian period is famous for Cambrian explosion when major groups of animals appeared in the fossil record in a relatively brief phase of time leading to diversification on a large scale.