488 followers
RT @polarwander: 67&68 / #365papers "A Mesoproterozoic iron formation" https://t.co/OAnOPHp3Cu in which ~12 meters of fine-grained sediment…
RT @polarwander: 67&68 / #365papers "A Mesoproterozoic iron formation" https://t.co/OAnOPHp3Cu in which ~12 meters of fine-grained sediment…
67&68 / #365papers "A Mesoproterozoic iron formation" https://t.co/OAnOPHp3Cu in which ~12 meters of fine-grained sedimentary deposits have Fe weight % that ventures above 20% in some horizons and is argued to be siderite (Fe-carbonate). And a BIF chap