Septaria nodule on custom stand

Beautiful septaria nodule cross-section on a metal stand. Septaria nodules are fossilised mud bubbles and are about 50 to 70 million years old. An important location for finding these objects is Belgium. Scientists do not agree on how the shape inside was formed. One possibility is the expansion/contraction of the spheres due to gas inside that cannot escape. This specimen is of very large size. Dimensions: 50H X 49W X 13.5D cm. 44W X 44H cm.