Septarian Geode

Please DO NOT use or modify the picture IN ANY WAY without my permission. Any use of the picture without MY agreement will be treated as an act of felony and offense. Featuring this picture ANYWHERE without being addressed back to me will not be taken lightly, and will also be recognized as an act of felony and offense.

This photo is copyrighted.

----------------------------------------------------

this is a septarian geode (not a nodule) from the late jurassic of utah, USA. this was found south of zion national park.

septarian nodules and geodes are formed by both dead organsims and geological movement. dead sea life in the bottom of the shore are buried in the ground as they rot. they chemically alter the surrounding mud and area around them, forming a nodule of dense material. then as the sea retreated, leaving the nodules to dry and crack in the sun, and bentonite inside the nodules shrank the nodules, creating the cracks inside. decomposed shells then seeped into the cracks, creating the calcite.