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EvC Forum ⇒ Science Forums ⇒ Dates and Dating ⇒

Questions about Xenoliths and dating

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Author Topic:   Questions about Xenoliths and dating
Dr Jack
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Message 12 of 13 (486286)
10-18-2008 5:34 AM 		Reply to: Message 1 by Human Shield
11-29-2005 6:30 PM

Is lava flows the only way to 'zero' a date? I heard that testing that produces older ages then expected is the resault of xenoliths (older rocks in the material). Are these xenoliths easily identified, or are they assumed?
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Xenoliths will typically have a different composition and grain size to the rock they are encased in. Large xenoliths are easy to spot; smaller ones less so.
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