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![](./images/clear.gif) 1.- A BIOSTRATIGRAPHICALLY WELL-CONSTRAINED K-BENTONITE U-PB ZIRCON AGE OF THE LOWERMOST DARRIWILIAN STAGE (MIDDLE ORDOVICIAN) FROM THE ARGENTINE PRECORDILLERA
INTERNATIONAL UNION OF GEOLOGICAL SCIENCES (IUGS); OTTAWA, ON; CAN; CANADA, 1997
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