Un Viaje INCRE脥BLE a los Oc茅anos Prehist贸ricos de la Tierra | Documental Historia de la Tierra

Un Viaje INCRE脥BLE a los Oc茅anos Prehist贸ricos de la Tierra | Documental Historia de la Tierra

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馃實 Hace unos 541 millones de a帽os, la distribuci贸n de la tierra y el mar era muy distinta de la que conocemos. Todo esto ocurri贸 mucho antes de la creaci贸n de Pangea.
Durante el per铆odo C谩mbrico, en la primera fase de la era Paleozoica, el oc茅ano Iapetus separ贸 Am茅rica del Norte de Am茅rica del Sur y 脕frica, que se unieron, denomin谩ndose Gondwana. El oc茅ano Rheic separa la costa africana del continente b谩ltico. Otros oc茅anos, como el Panthalassa y el Palaeotethys, cubren una zona muy extensa entre el norte de China y Siberia.

A lo largo de millones de a帽os, los continentes se han ido separando, los oc茅anos se han expandido y se han abierto a otros. La tierra se separ贸 y nacieron los microcontinentes. As铆 ocurri贸 en el Dev贸nico con Avalonia, que inclu铆a Canad谩, Inglaterra, Gales, Francia y Dinamarca. En el Carbon铆fero, el norte de China se redujo y qued贸 aislado de los dem谩s continentes y microcontinentes.
Durante el P茅rmico, comenzaron nuevos movimientos que acercaron las masas de tierra para formar Pangea.
En el Tri谩sico, el oc茅ano Thetys fue cortado. Comenz贸 a abrirse, dando lugar al oc茅ano Atl谩ntico y rompiendo Pangea. Las subducciones de placas, cuando una placa se desliza bajo otra, y las orogenias, los movimientos de placas que dan lugar a la formaci贸n de monta帽as, siguen dando forma al planeta y le confieren un nuevo rostro con el paso del tiempo. La actividad de las dorsales oce谩nicas mantiene alto el nivel del mar. Los mares poco profundos cubren algunos continentes. Otros fen贸menos provocan flujos de basalto. Los continentes se desprenden uno a uno.
La tierra y el agua parecen estar en perpetuo movimiento. Cada uno de estos movimientos llevar谩 a los continentes un poco m谩s a la deriva hasta formar el mundo que conocemos hoy.

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馃敟 Como recordatorio, los v铆deos se publican los DOMINGOS a las 18:00.

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馃挜 Oc茅anos prehist贸ricos:
– El E贸n Paleozoico, y m谩s a煤n el primer periodo del Paleozoico, el C谩mbrico, marca un verdadero punto de inflexi贸n para la vida en la Tierra. Hasta entonces, los organismos unicelulares eran los 煤nicos que poblaban nuestro planeta. Ninguno de ellos posee una c茅lula particular que pueda, por ejemplo, producir 贸rganos internos. Son protozoos de cuerpo blando. Se alimentan a trav茅s de la membrana celular… que es su propio cuerpo.

El C谩mbrico marca un cambio extraordinario y sin precedentes: el nacimiento de los organismos pluricelulares. Adem谩s de la aparici贸n de estos nuevos seres vivos, el C谩mbrico tambi茅n es sin贸nimo de explosi贸n de la vida, que prolifer贸 durante este periodo.
En resumen, lo que hay que recordar sobre la era c谩mbrica es que la vida pulula y se diversifica por todo el mundo. Los animales siguen siendo en gran medida organismos de cuerpo blando, pero sus c茅lulas diferenciadas les permiten adaptarse a su entorno y evolucionar. Aparecen 贸rganos internos y externos espec铆ficos: ojos, patas, antenas, aparato bucal, aparato digestivo, sistema nervioso.

Tambi茅n se establece una cadena alimentaria que favorece el desarrollo de la vida en el oc茅ano.

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馃幀 En el programa de hoy:
– 00:00 – Introducci贸n
– 00:22 – El nacimiento del oc茅ano mundial
– 11:17 – Evoluci贸n de los oc茅anos y deriva continental
– 13:34 – E贸n paleozoico, edad de los peces, aire de cambio
– 15:13 – I. El C谩mbrico
– 21:57 – Artr贸podos: Trilobites
– 23:23 – Yohoia
– 24:57 – Canadaspis
– 25:25 – Archaeocyathas
– 26:47 – Anomalocaris
– 27:55 – II. Ordov铆cico
– 31:47 – Bivalvos
– 32:30 – Familia de los gaster贸podos
– 33:26 – Orthoceras
– 34:45 – Agnatha
– 39:11 – III. El Sil煤rico
– 39:58 – An谩psidos
– 40:33 – Osteostr谩ceos
– 42:00 – Acantodios
– 42:56 – Euript茅ridos
– 44:24 – Placodermos
– 45:25 – IV. Dev贸nico
– 46:43 – Estromatoporos
– 47:15 – Bothriolepis
– 47:57 – Placodermos: Dunkleosteus
– 48:34 – Cladoselache
– 50:41 – V. Carbon铆fero
– 52:20 – Crinoideos
– 53:03 – Helicoprion bessonovi
– 53:30 – Stethacanthus
– 54:20 – VI. P茅rmico
– 55:39 – Condrictios
– 56:34 – Actinopterigios
– 57:20 – Anfibios
– 01:01:38 – Era Mesozoica
– 01:02:30 – VII. Tri谩sico
– 01:04:46 – Ictiosaurios
– 01:05:23 – Nothosaurus
– 01:06:16 – Ceresiosaurio
– 01:06:50 – Paquipleurosaurios
– 01:07:35 – VIII. Jur谩sico
– 01:09:03 – Hildoceras
– 01:09:53 – Stenopterygius
– 01:10:40 – Plesiosaurios
– 01:12:54 – IX. Cret谩cico
– 01:14:03 – Hidroterosaurio
– 01:15:03 – Mosasaurios

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