1. Education

Common Pseudofossils


5 of 12

Geodes and Septarian Nodules
Knobs with crystalline guts

Click the image for a larger version

Photo courtesy Kent Simonsen, all rights reserved
Geodes are openings that grow within shaly rocks during the process of consolidation. Often they are lined with mineral crystals or smooth, milky layers of chalcedony. Septarian nodules also have crystalline matter inside them, they send out cracks as they grow and may not have an opening in their centers. Water-worn examples may look like turtle shells or weird sea creatures, but they are not fossils.
See More About
  1. About.com
  2. Education
  3. Geology
  4. Fossils, Time & Evolution
  5. Collect Fossils
  6. Geodes and Septarian Nodules - Common Pseudofossils

©2014 About.com. All rights reserved.