See archived copy instead

Dating for 4 years no proposal

No words could ever express my gratitude. The methods work too well most of the time. It demonstrates how consistent radiometric data can be when the rocks are more suitable for dating. Spore-bearing land plants like ferns were always found before the occurrence of flowering plants.

Every piece of

So far, I know of no valid theory that explains how this could occur, let alone evidence in support of such a theory, although there have been highly fallacious attempts e. The unfortunate part of the natural process of refinement of time scales is the appearance of circularity if people do not look at the source of the data carefully enough. Hailey shared her excitement on Twitter a few hours later. This observation led to attempts to explain the fossil succession by various mechanisms.

You can't deform a structure e. Every piece of data collected like this is an independent check of what has been previously studied. Dinosaurs were found after the first occurrence of land plants, insects, and amphibians. However, this statistical likelihood is not assumed, it is tested, usually by using other methods e. The time scale is refined to reflect the relatively few and progressively smaller inconsistencies that are found.

Even in complex situations of multiple deposition, deformation, erosion, deposition, and repeated events, it is possible to reconstruct the sequence of events. This reconstruction is tested and refined as new field information is collected, and can be and often is done completely independently of anything to do with other methods e. The real question is what happens when conditions are ideal, versus when they are marginal, because ideal samples should give the most reliable dates.

You can't deform a