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The most widely researched type of such mineral deposits are rock varnishes, dark-brown to almost black ferromanganous coatings found in many envi- ronments, but best preserved in arid regions due to their high-pH and low precipitation regimes.
For instance, it is self-evident that this ferromanganous accretion would be well suited to palaeomagnetic dating, and yet none of the projects favouring CR dating has included a comparative study using this method (Clayton, Verosub & Harrington, 1990).
I had long been sceptical, at least in respect of specific types of deposits (particularly ferromanganous accretions), after estab- lishing during the 1970s that their carbon isotope system was essentially open (Bednarik, 1979), and that carbons occur widely in surfaces and substrates.
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