Echinoid Fossil Value Guide

This Cretaceous Period Echinoid fossil represents a remarkably preserved sea urchin from ancient American marine beds. Its intricate globular structure and fossilized rock composition make it a vital specimen for understanding prehistoric marine ecosystems.

What affects the value of Echinoid Fossil?

• The clarity of the structural features and the lack of significant erosion on the test (shell).
• The quality of the calcite replacement and whether the fossil is free-standing or embedded in a matrix.
• The overall size and completeness of the specimen, with values for quality US examples typically reaching $70-$90.

How to Identify Echinoid Fossil?

• Look for the distinct five-fold radial symmetry characteristic of the echinoid's globular body.
• Examine the surface for well-preserved ambulacral grooves and tubercle scars where spines once attached.
• Verify the presence of calcite mineralization within the sedimentary rock matrix, typical of US Cretaceous finds.

History of Echinoid Fossil

Echinoids are ancient marine invertebrates that have existed for hundreds of millions of years, with their fossil record dating back to the Ordovician period. These creatures, characterized by their spiny, globular bodies, have evolved into a diverse group. Fossils like this provide crucial insights into prehistoric marine ecosystems and the evolutionary history of life on Earth. Many are found in sedimentary rock layers, particularly in regions that were once submerged under ancient seas.