Triassic
Triassic
Triassic (pronunciation: /traɪˈæsɪk/) is a term used in geology to refer to a specific period in the Mesozoic Era. The term originates from the Latin word "Trias", referring to the three divisions of the period: the Early Triassic, Middle Triassic, and Late Triassic.
Etymology
The term "Triassic" is derived from the Latin word "Trias", which means "threefold". This is in reference to the three distinct rock layers (divisions) that are found globally in similar types of sediment, which are collectively called the "Three-fold Sequence".
Definition
The Triassic period is a geological period and system which spans 50.6 million years from the end of the Permian Period 251.9 million years ago (Mya), to the beginning of the Jurassic Period 201.3 Mya. The Triassic is the first and shortest period of the Mesozoic Era. Both the start and end of the period are marked by major extinction events.
Related Terms
- Mesozoic Era: The era in which the Triassic period occurred, often referred to as the "Age of Reptiles".
- Permian Period: The geological period immediately preceding the Triassic.
- Jurassic Period: The geological period immediately following the Triassic.
- Extinction event: A widespread and rapid decrease in the biodiversity on Earth, marking the end of both the Permian and Triassic periods.
External links
- Medical encyclopedia article on Triassic
- Wikipedia's article - Triassic
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