Jurassic

Jurassic යනු මීට වසර මිලියන 201-145 කට පෙර, එනම් Mesozoic යුගයේ දෙවන කාල පරිච්ඡේදය වේ.

Jurassic
201.3 ± 0.2 – ~145.0 Ma PreЄ Є O S D C P T J K Pg N
Chronology
−200 — – −195 — – −190 — – −185 — – −180 — – −175 — – −170 — – −165 — – −160 — – −155 — – −150 — – −145 — – Mesozoic Triassic Jurassic Cretaceous Early Middle Late Hettangian Sinemurian Pliensbachian Toarcian Aalenian Bajocian Bathonian Callovian Oxfordian Kimmeridgian Tithonian       ← Triassic–Jurassic extinction event Subdivision of the Jurassic according to the ICS, as of 2022. Vertical axis scale: millions of years ago.
Etymology
Name formality	Formal
Usage information
Regional usage	Global (ICS)
Time scale(s) used	ICS Time Scale
Definition
Chronological unit	Period
Stratigraphic unit	System
Time span formality	Formal
Lower boundary definition	First appearance of the ammonite Psiloceras spelae tirolicum.
Lower boundary GSSP	Kuhjoch section, Karwendel mountains, Northern Calcareous Alps, Austria 47°29′02″N 11°31′50″E / 47.4839°N 11.5306°E / 47.4839; 11.5306
GSSP ratified	2010
Upper boundary definition	Not formally defined
Upper boundary definition candidates	Magnetic—base of Chron M18r Base of Calpionellid zone B FAD of ammonite Berriasella jacobi
Upper boundary GSSP candidate section(s)	None

සටහන්

මූලාශ්‍ර

1. "International Chronostratigraphic Chart" (PDF). International Commission on Stratigraphy.