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Politics : Evolution -- Ignore unavailable to you. Want to Upgrade?

To: Greg or e who wrote (13795)	2/20/2011 2:28:20 AM
From: Jacques Chitte	Read Replies (1) \| Respond to of 69300

The age of the Burgess Shale can be determined by methods that are independent of the fossils. The prime technique there is radioisotopic, relating to uranium/lead ratios in mineral grains. The technique is established enough that the error bars are about one per cent of the age. I looked online for an isotopic age for the shale but could not find. I did find reason to post a correction. Current age estimate is 505 Ma, not 530 as I'd posted. The age I'd memorized long ago is obsolete... Uniformitarianism ... got me there. I do subscribe to it, unless/until a serious challenge to it emerges from the study of this planet or others. I am not aware of one, and uniformitarianism has a lot to recommend it.