Commutatio agronomica
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Commutatio agronomica[1] (Anglice Agronomic revolution), quá biota substratum marinum invadere, incolere, excavare coeperunt, aevo Cambrio ineunte accidisse olim censebatur. Indicia recenter reperta hanc commutationem ad tempora anteriora aevi Ediacarii reportandam suadent.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/f/f0/Cambrian_substrate_revolution_02.png)