Muaj pes tsawg txheej pob zeb nyob hauv Grand Canyon?
Muaj pes tsawg txheej pob zeb nyob hauv Grand Canyon?

Video: Muaj pes tsawg txheej pob zeb nyob hauv Grand Canyon?

Video: Muaj pes tsawg txheej pob zeb nyob hauv Grand Canyon?
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Ib yam li ntawd, nws raug nug, hom pob zeb twg ua rau Grand Canyon?

sedimentary pob zeb

Ib sab saum toj no, dab tsi yog qhov qub tshaj plaws ntawm pob zeb hauv Grand Canyon? Nco ntsoov, lub pob zeb qub hauv Grand Canyon yog 1.8 billion xyoo. Cov hav dej yog hluas tshaj qhov pob zeb los ntawm qhov nws cua. Txawm tus yau pob zeb txheej , Kaibab Formation, yog 270 lab xyoo, ntau xyoo laus dua cov hav dej nws tus kheej. Geologists hu rau cov txheej txheem ntawm hav dej tsim downcutting.

Tsis tas li ntawd, qhov txawv pob zeb txheej ntawm Grand Canyon qhia peb li cas?

Stratigraphy yog kev tshawb fawb ntawm cov pob zeb txheej txheej, thiab nthuav tawm ntau cov ntaub ntawv hais txog lub ntiaj teb zoo li cas thaum txhua tus txheej tsim. Hauv Grand Canyon , muaj yog meej kab rov tav txheej ntawm txawv pob zeb uas muab cov ntaub ntawv hais txog qhov twg, thaum twg, thiab yuav ua li cas lawv tau tso, ntev ua ntej hav dej twb txawm carved.

Cov txheej saum toj kawg nkaus ntawm Grand Canyon yog dab tsi?

Cov sab saum toj txheej ntawm Grand Canyon , Kaibab Limestone, muaj ntau cov pob txha hauv hiav txwv uas qhia tau hais tias nws nyob hauv qab hiav txwv. Qhov no txheej yog nyob ib ncig ntawm 250 lab xyoo.

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