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"Fogel, Hannah, 1st Block, Biology." : Ecology Video Lecture Notes. N.p., n.d. Web. 29 Mar. 2016. http://fogelh1stblockbio.blogspot.com/2014/09/ecology-video-lecture-notes.html.
Assuming this chart is demonstrating primary succession, identify the time period(s) in which soil would be present (or in the process of being created)?