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The top documents tagged [graded crinoid bed]
Limestone, Chert, or Limestone? [2013225_fieldtrip]
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![Limestone, Chert, or Limestone? [2013225_fieldtrip]](https://static.fdocuments.in/doc/330x215/558421bfd8b42a86478b4731/limestone-chert-or-limestone-2013225fieldtrip.jpg)
