Although we do not exclude that some of the observed Moodies laminae were originally microbial mats, the mineral assemblage of the studied anastomosing and wavy laminae (i.e., mainly sericite associated with Ti oxide and rare carbonaceous material) shows a substantial metamorphic overprint, implying that similar laminae cannot be unambiguously associated with the concept of a flourishing Paleoarchean microbial life at 3.22 Ga.
Source: wiktionary
This is the first report from the Alps of eclogite-facies rocks of supposed Alpine age showing a granulite-facies metamorphic overprint, which is, in contrast, well documented in the Variscan belt.
Source: wiktionary
The metasomatic overprint is represented mainly by enrichments in Na, K, Ba, Ti and LREE and the original source of this fluid remains unknown.
Source: wiktionary
This is the way overprinting works on the ZX Spectrum: two papers or two inks give a paper, one of each gives an ink. This has the interesting property that if you overprint with the same thing twice you get back what you started off with.
Source: wiktionary
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