Diagenetic formation of bedded chert: Evidence from chemistry of the chert-shale couplet

@lockwooddewitt Theory has it that siliceous ooze can evolve into bedded chert via zones of sea-floor parallel precipitation and dissolution. Traction deposits would be intermixed so in some cases it would be a bit of both primary and secondary bedding. It

@feline_cannon @callanbentley Origin of idea may be Murray et al. 1992 (https://t.co/WX233mvql5) although more recent work seems to link the chert-shale couplets to blooms, Milankovitch cycles and climate events so diagenetic enhancement doesn't seem to be