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Image: Bif in time

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Description: This graph shows the relative abundance of banded iron formations in the geologic record, as a function of time before the present. Color indicates dominant type. Light yellow = older Archean formations; dark yellow = Greater Gondwana formations; brown = granular iron formations; red = Snowball Earth formations. Adapted from Trendall, A.F. (2002). "The significance of iron-formation in the Precambrian stratigraphic record". In Altermann, Wladyslaw; Corcoran, Patricia L. (eds.). Precambrian Sedimentary Environments: A Modern Approach to Ancient Depositional Systems. Blackwell Science Ltd., ISBN 0-632-06415-3
Title: Bif in time
Credit: Own work
Author: Kent G. Budge
Usage Terms: Creative Commons Zero, Public Domain Dedication
License: CC0
License Link: http://creativecommons.org/publicdomain/zero/1.0/deed.en
Attribution Required?: No

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