Fossil - Septarian Nodules Cut Polished Pairs
 
approx 5.5-6.5cm
16-22 grams
 
Polished halves of a Septarian nodule.
Septarian nodules are the result of angular cavities in sedimentary layers of rocks later being filled with softer stone and concreted together. This geological process makes the nodule harder than its surroundings, so more resistant to weathering, allowing the nodules to be obtained.