I fail to see how evolutionary dates relate to the topic of a literalist Noah's Flood scenario.  The literalist scenario implies a young earth (6000-10000 years), and Noah's Flood itself is said by Creationists to be responsible for the layers used date things.  Radiometric dating is also largely unnaccepted by Creationists because it relies on the same uniformitarian assumptions that are the basis for the strata readings.  Anyway, with the ice age, it may not be too pertinent to Australia, but it does apply to North America.  The reason I brought NA up in the first place was because someone earlier had pulled it into the picture.