Qarsoon ee dunida - muddada Cambrian

Sida laga soo xigtay sayniska rasmiga ah, nolosha asalkiisu ka soo jeedo meerahaas qiyaastii saddex bilyan oo sano ka hor ee foomka of noolaha fudud - dhengedihii cqaadir go'doon, dhismayaasha filamentary, algae goobaabin polygonal-unuglaha. noolaha waa ay jiraan karaa oo kaliya in biyaha oo kaliya in cimiladu diiran.

Guud ahaan, in ay ka badbaaday fossils aad u yar oo ka soo muddada Precambrian. Evolution u muuqataa hakad tan iyo markii la aasaasay nolosha on saddex bilyan oo sano, la beddelo oo kaamilayna noocyada kaliya ee hadda jira ee algae iyo noolaha cqaadir.

Si kastaba ha ahaatee, 580 milyan oo sano ka hor, at tub ah ee taariikhda horumar - muddada Cambrian. Its duration waa gudahood nolosha dhulka waa yar yahay - 80 milyan oo sano. Waxaa markaas ahaa in si lama filaan ah iyo ku dhowaad mar waxaa jiray noocyo kala duwan oo la yaab leh ee noocyada invertebrate. More muhiimsan - noolaha in waqti gaaban ay awoodaan si ay u bartaan lafaha ah calcareous adag.

noocyada noolaha kala duwan ee Cambrian ahaa horreeyay ee cayn kasta oo nolosha casriga ah, oo ay ku jiraan aadanaha. Tani waa dhacdo hal mar ah iyo kala duwanaanta af badan ee noocyada loo yaqaan qaraxa Cambrian.

Land waqtiga ahaa pustnynyu wayn, dhammaan nolosha waxaa ku urursan keliya ee biyaha. Qaaradood ee dhulka lahaa meel gebi ahaanba ka duwan, tusaale ahaan, on goobta of Greenland iyo North America waa koonfurta qaaradda Lavrentsov ahaa waynaha reer Brazil. Arabia, Africa iyo Madagascar ahaayeen qaaradda Afrika midaysan, oo ku yaalla waqooyiga ee dhulweynaha Ruush, kala ah Strait of qoto dheer Siberian iyo dhulweynaha Shiinaha. Koonfurta, waxaa jiray dhulweynaha a Australian Rafaa, taasi oo markii dambe kor u galay Hindiya, Australia iyo tiro ka mid ah jasiiradaha.

In muddo ah Cambrian soo baxay qaar ka mid ah buurta casriga ah: Northern Appalaachian Mountains, Sayan Mountains Ridge Chingiztau ah (Kazakhstan).

In biyaha, si degdeg ah nolosha magooshay, isagoo degay iyo trilobites, radiolarians, buushka, brachiopods. archeocyathids muuqday - xayawaanka multicellular, taas oo iskutallaabta ka dhexeeya shacaab iyo buushka. Waxay ballaaran ku xidheen hoose ee jirkooda biyaha, la xirrira nooc ah Qoryaale dhagax badeed. By dhamaadka Cambrian ah, waxayna la mid noqdeen bakhtiyeen.

Wakhtigan, gaar ahaan trilobites Shafay - cayayaanka heer hoose sida woodlice casriga ah. Waxay lahaa jirka ah disk-qaabeeya guri la hubkiisa chitinous, qaybsan 45-50 qaybaha iyo hannaanka ka mid ah lugaha.

Xagga dhamaadka Cambrian waxaa ka joogay vertebrates gaashaaman ugu horeysay, prototypes kalluunka.

Sidaas, iyada oo aan nooc kasta KMG ah iyo noocyada qabanaya dhexe bakteeriyada iyo protozoa in dunida si lama filaan ah sameeyay noocyada badan invertebrate iyo laf, prototypes foomamka casriga ah. Muddada Cambrian waa boodi duugi evolutionary taariikhda dhulka ee.

Xaaladaha intooda badan cilmi u sabab this dhacdo raasamaal kacaan muhiim ah oxygen hawada badda, iyo sidoo kale sii kordhaya ee cusbada biyo-raaciska ee sushi iyo kordhinta uruureen ah calcium iyo magnesium in biyaha. The kiimikada ka kooban biyaha ayaa bedelay wax badan in noolaha ee halkaa ku nool, ka helay badan oo fursadaha isbeddelka iyo formation of noocyada.

Xitaa soo jeedinaya in at ah oo ku saabsan waqtigan, dhulka ayaa inqilaab lama filaan ah ku dhowaad 90 digrii, taas oo ah sababta ay jirto ahayd guuritaan weyn oo ka mid ah qaaradaha oo dhan, gelinba tectonic iyo formation of gargaarka casriga ah ee dusha dhulka ee. Waxa kale oo ay saamayn ku formation of noocyada iyo qalabka cusub ee ay u noolaadaan.

Muddooyinka oo ka mid ah dhulka horumar la kulmay badan oo masiibooyin Sayidka, ku dhowaad isku mar ah oo aan dinosaurs marka laga reebo la waayay 65 milyan oo sano ka hor. Oo xilligii Permian in muddo gaaban waqti isku mid ah ay u bakhtiyeen noqday ku dhawaad 95% ka mid ah nolosha badda - waxay ahayd 245 milyan oo sano ka hor.

Laakiin ka mid ah waxyaalaha qarsoon oo dhan, kuwaas oo kaliya muddada Cambrian kala duwan ay hal abuur leh, halkii burburinta noocyada. Dadka ka soo horjeeda ee hab evolutionary arko in xujo ee xaqiijinta qarax Cambrian asal ahaan rabbaaniga ah ee noocyada casriga ah ee nolosha, oo ay ku jiraan aadanaha.