Cretaceous

Cretaceous
Chronology
සැකිල්ල:Cretaceous graphical timeline
Etymology
Name formality	Formal
Usage information
Celestial body	Earth
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	Not formally defined
Lower boundary definition candidates	Magnetic—base of Chron M18r Base of Calpionellid zone B FAD of Ammonite Berriasella jacobi
Lower boundary GSSP candidate section(s)	None
Upper boundary definition	Iridium-enriched layer associated with a major meteorite impact and subsequent K-Pg extinction event
Upper boundary GSSP	El Kef Section, El Kef, Tunisia 36.1537°N 8.6486°E / 36.1537; 8.6486
GSSP ratified	1991

Cretaceous යනු මීට වසර මිලියන 145-66 කට පෙර, එන්ම් Mesozoic යුගයේ තුන්වන සහ අවසාන කාලපරිඡ්ඡේදය වේ.

ආශ්‍රිත

• Mesozoic Era
• Cretaceous-Paleogene extinction
• Chalk Formation
• Cretaceous Thermal Maximum
• List of fossil sites (with link directory)
• South Polar region of the Cretaceous

මූලාශ්‍ර

භාහිර සබැඳි

• UCMP Berkeley Cretaceous page
• Cretaceous Microfossils: 180+ images of Foraminifera
• Cretaceous (chronostratigraphy scale) සංරක්ෂණය කළ පිටපත 2022-08-18 at the Wayback Machine
• "Cretaceous System" . එන්සයික්ලොපීඩියා බ්‍රිටැනිකා. Vol. 7 (11th ed.). 1911. pp. 414–418.