Drumian

Key events in the Cambrian

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Ediacaran

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Ordovician

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Fortunian

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"Stage 3"

"Stage 4"

"Stage 5"

Drumian

Guzhangian

Paibian

Jiangshanian

"Stage 10"

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Baykonur
glaciation

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Orsten Fauna

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Burgess Shale

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Kaili biota

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Archaeocyatha extinction

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Emu Bay Shale

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Sirius Passet biota

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Chengjiang biota

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First Trilobites

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SSF diversification, first brachiopods & archaeocyatha

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First halkieriids, mollusсs, hyoliths SSF

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Treptichnus pedum trace
Large negative peak δ 13C_carb excursion

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First Cloudina & Namacalathus mineral tubular fossils

Stratigraphic scale of the ICS subdivisions and Precambrian/Cambrian boundary.

The Drumian is a stage of 3rd series of the Cambrian. It succeeds still unnamed 5th stage of the Cambrian and precedes the Guzhangian. The base is defined as the first appearance of the trilobite Ptychagnostus atavus around ~504.5 million years ago. The top is defined as the first appearance of another trilobite Lejopyge laevigata around ~500.5 million years ago.

单词	Drumian
释义	Drumian 英语百科 Drumian Key events in the Cambrian view • discuss • -550 — – -540 — – -530 — – -520 — – -510 — – -500 — – -490 — – N e o p r o t e r o z o i c P a l e o z o i c Ediacaran C a m b r i a n Ordovician T e r r e n e u v i a n S e r i e s 2 S e r i e s 3 F u r o n g i a n Fortunian "Stage 2" "Stage 3" "Stage 4" "Stage 5" Drumian Guzhangian Paibian Jiangshanian "Stage 10" * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Baykonur glaciation Baykonur glaciation * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ← Orsten Fauna ← Burgess Shale ← Kaili biota ← Archaeocyatha extinction ← Emu Bay Shale ← Sirius Passet biota ← Chengjiang biota ← First Trilobites ← SSF diversification, first brachiopods & archaeocyatha ← First halkieriids, mollusсs, hyoliths SSF ← Treptichnus pedum trace Large negative peak δ 13C_carb excursion ← First Cloudina & Namacalathus mineral tubular fossils Stratigraphic scale of the ICS subdivisions and Precambrian/Cambrian boundary. The Drumian is a stage of 3rd series of the Cambrian. It succeeds still unnamed 5th stage of the Cambrian and precedes the Guzhangian. The base is defined as the first appearance of the trilobite Ptychagnostus atavus around ~504.5 million years ago. The top is defined as the first appearance of another trilobite Lejopyge laevigata around ~500.5 million years ago.
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