English: Scientific papers on hardgrounds by period. Serves as a proxy for hardground abundance over time. Calcite and aragonite sea intervals are plotted on the time axis.
Graph made by Mark A. Wilson (Department of Geology, The College of Wooster).
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{{Information |Description={{en|1=Scientific papers on hardgrounds by period. Serves as a proxy for hardground abundance over time.}} |Source=Own work by uploader |Author=Wilson44691 |Date=September 13, 2008 |Permission= |other_versio