Cambrian
Cambrian | |
---|---|
538.8 ± 0.2 – 485.4 ± 1.9 Ma | |
![]() Earth in the middle of the Cambrian Period | |
Chronology | |
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 |
First proposed by | Adam Sedgwick, 1835 |
Time span formality | Formal |
Lower boundary definition | Appearance of the Ichnofossil Treptichnus pedum |
Lower boundary GSSP | Fortune Head section, Newfoundland, Canada 47°04′34″N 55°49′52″W / 47.0762°N 55.8310°W |
GSSP ratified | 1992[1] |
Upper boundary definition | FAD of the Conodont Iapetognathus fluctivagus. |
Upper boundary GSSP | Greenpoint section, Green Point, Newfoundland, Canada 49°40′58″N 57°57′55″W / 49.6829°N 57.9653°W |
GSSP ratified | 2000[2] |
Atmospheric and climatic data | |
Sea level above present day | Rising steadily from 4 m to 90 m[3] |
Cambrian Period යනු Paleozoic යුගයේ පළමු කාලපරිච්ඡේදය, එනම් වසර මිලියන 539-485 කට පෙර යුගය වේ.
ගැලරිය[සංස්කරණය]
Stromatolites of the Pika Formation (Middle Cambrian) near Helen Lake, Banff National Park, Canada
Trilobites were very common during this time
Anomalocaris was an early marine predator, among the various arthropods of the time
Opabinia was a creature with an unusual body plan; it was probably related to arthropods
Pikaia was a stem-chordate from the Middle Cambrian
Protichnites were the trackways of arthropods that walked Cambrian beaches
Hallucigenia sparsa was a member of group lobopodian, that is considered to related to modern velvet worms.
Cambroraster falcatus was a large arthropod for the era
ආශ්රිත[සංස්කරණය]
- Cambrian–Ordovician extinction event – circa 488 mya
- Dresbachian extinction event—circa 499 mya
- End Botomian extinction event—circa 513 mya
- List of fossil sites (with link directory)
- Type locality (geology), the locality where a particular rock type, stratigraphic unit, fossil or mineral species is first identified
සැකිල්ල:Cambrian preservational modes
මූලාශ්ර[සංස්කරණය]
- ↑ Brasier, Martin; Cowie, John; Taylor, Michael. "Decision on the Precambrian-Cambrian boundary stratotype" (PDF). Episodes. 17. සම්ප්රවේශය 6 December 2020.
- ↑ Cooper, Roger; Nowlan, Godfrey; Williams, S. H. (March 2001). "Global Stratotype Section and Point for base of the Ordovician System" (PDF). Episodes. 24 (1): 19–28. doi:10.18814/epiiugs/2001/v24i1/005. සම්ප්රවේශය 6 December 2020.
- ↑ Haq, B. U.; Schutter, SR (2008). "A Chronology of Paleozoic Sea-Level Changes". Science. 322 (5898): 64–8. Bibcode:2008Sci...322...64H. doi:10.1126/science.1161648. PMID 18832639. S2CID 206514545.
භාහිර සබැඳි[සංස්කරණය]

Cambrian හා සබැඳි මාධ්ය විකිමාධ්ය කොමන්ස් හි ඇත.
- සැකිල්ල:In Our Time
- Biostratigraphy – includes information on Cambrian trilobite biostratigraphy
- Dr. Sam Gon's trilobite pages (contains numerous Cambrian trilobites)
- Examples of Cambrian Fossils
- Paleomap Project
- Report on the web on Amthor and others from Geology vol. 31
- Weird Life on the Mats
- Chronostratigraphy scale v.2018/08 | Cambrian