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Superposition dating

My thanks to both him and other critics for motivating me.

Much of the Earth's geology consists of successional layers of different rock types, piled one on top of another.

There are situations where it potentially fails -- for example, in cave deposits.Fundamental to stratigraphy are a set of simple principles, based on elementary geometry, empirical observation of the way these rocks are deposited today, and gravity.Most of these principles were formally proposed by Nicolaus Steno (Niels Steensen, Danish), in 1669, although some have an even older heritage that extends as far back as the authors of the Bible.To get to that point, there is also a historical discussion and description of non-radiometric dating methods.The example used here contrasts sharply with the way conventional scientific dating methods are characterized by some critics (for example, refer to discussion in "Common Creationist Criticisms of Mainstream Dating Methods" in the Age of the Earth FAQ and Isochron Dating FAQ).A few principles were recognized and specified later.An early summary of them is found in Charles Lyell's .In this situation, the cave contents are younger than both the bedrock below the cave and the suspended roof above.However, note that because of the "principle of cross-cutting relationships", careful examination of the contact between the cave infill and the surrounding rock will reveal the true relative age relationships, as will the "principle of inclusion" if fragments of the surrounding rock are found within the infill.It is these highly consistent and reliable samples, rather than the tricky ones, that have to be falsified for "young Earth" theories to have any scientific plausibility, not to mention the need to falsify huge amounts of evidence from other techniques.This document is partly based on a prior posting composed in reply to Ted Holden.

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  1. Erosion, Weathering, Relative Dating The geological definition of weathering is simply breaking something down and erosion is moving it,

  2. This document discusses the way radiometric dating and stratigraphic principles are used to establish the conventional geological time scale.

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