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. 2014 Dec 12;4:7463. doi: 10.1038/srep07463

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(a), Variations of kaolinite versus depth. (b), Vertical fluctuations of color index of redness (a*). (c), Variations of Fe₂O₃ content of the Keziletuogayi section. (d) and (e), High-resolution curves of the redness (a*) and the Fe₂O₃ content across the Eocene–Oligocene Boundary. Red arrow indicates the variation trend at the Eocene–Oligocene Boundary.