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and where there is a lack of other indications of the relative ages of beds within the sequence, such as in the Precambrian where fossils are rare.

The original definition comes from Bruno Sander in 1936, translated from German to English in 1951, which states:

Geopetal Fabrics - All the widely distributed spatial characters of a fabric that enable us to determine what was the relation of "top" to "bottom" at the time when the rock was formed are termed geopetal fabrics. Such fabrics are mechanical and chemical internal deposition; grains on a boundary surface; cross-bedding, etc.

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