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Cretaceous .
Cretaceous සැකිල්ල:Cretaceous graphical timeline
Name formality Formal Celestial body Earth Regional usage Global (ICS) Time scale(s) used ICS Time Scale 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°09′13″N 8°38′55″E / 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.
Mesozoic Era
Cretaceous-Paleogene extinction
Chalk Formation
Cretaceous Thermal Maximum
List of fossil sites (with link directory)
South Polar region of the Cretaceous
Cretaceous හා සබැඳි මාධ්ය විකිමාධ්ය කොමන්ස් හි ඇත.
cretaceous , යන්න නිදහස් ශබ්දකෝෂය වන වික්ෂනරිය දී සොයා බලන්න.
සැකිල්ල:Cretaceous Footer
මහ පොළොවේ භූවේදාත්මක ඉතිහාසය
Cenozoic Era(present–66.0 Ma)
Quaternary (present–2.58 Ma)
Holocene (present–11.8 ka)
Pleistocene (11.8 ka–2.58 Ma)
Neogene (2.58–23.0 Ma)
Pliocene (2.59–5.33 Ma)
Miocene (5.33–23.0 Ma)
Paleogene (23.0–66.0 Ma)
Oligocene (23.0–33.9 Ma)
Eocene (33.9–56.0 Ma)
Paleocene (56.0–66.0 Ma)
Mesozoic Era(66.0–252 Ma)
Paleozoic Era(252–539 Ma)
Proterozoic Eon(539 Ma–2.5 Ga)
Neoproterozoic (539 Ma–1 Ga)
Ediacaran (539–635 Ma)
Cryogenian (635–720 Ma)
Tonian (720 Ma–1 Ga)
Mesoproterozoic (1–1.6 Ga)
Stenian (1–1.2 Ga)
Ectasian (1.2–1.4 Ga)
Calymmian (1.4–1.6 Ga)
Paleoproterozoic (1.6–2.5 Ga)
Statherian (1.6–1.8 Ga)
Orosirian (1.8–2.05 Ga)
Rhyacian (2.05–2.3 Ga)
Siderian (2.3–2.5 Ga)
Archean Eon (2.5–4 Ga)
Neoarchean (2.5–2.8 Ga)
Mesoarchean (2.8–3.2 Ga)
Paleoarchean (3.2–3.6 Ga)
Eoarchean (3.6–4 Ga)
Hadean Eon (4–4.6 Ga)
ka = kiloannum (thousands years ago);
Ma = megaannum (millions years ago);
Ga = gigaannum (billions years ago).
See also: Geologic time scale •
Geology ද්වාරය •
World ද්වාරය
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