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Lower Devonian

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Lower Devonian [′lō·ər də′vō·nē·ən]
(geology)
The earliest epoch of the Devonian period of geologic time, extending from about 400- to 385,000,000 years ago.


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The Tamadanet Well discharged 5,883 cubic metres of gas per hour (gph) from the Ordovician reservoir (units III 3 and II) and 3,619 cubic metres of gph from the Lower Devonian reservoir F, the source pointed out.
indentatus was used for that purpose, showing a rather limited stratigraphic range from the upper half of the Pridoli, Upper Silurian, to the lowermost Lochkovian, Lower Devonian (e.
The regression, which had started in the Silurian and continued with short interruptions also in the lower Devonian (Kemeri time), marks the geocratic period separating the Caledonian and Herzynian tectonic stages (Nestor & Einasto 1997).
 
 
 
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