# Fósil de erizo de mar (Pentremites godoni), Waterloo, Illinois, Estados Unidos, 2021-01-18, DD 081-136 FS

- By: Diego Delso
- Date: 2021-01-18
- Classification: Photograph
- Museum: [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:F%C3%B3sil_de_erizo_de_mar_(Pentremites_godoni),_Waterloo,_Illinois,_Estados_Unidos,_2021-01-18,_DD_081-136_FS.jpg)
- Rights: [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0)
- Picture: https://invisiblenetwork.ai/thumbs/commons/thumb/3/31/F%C3%B3sil_de_erizo_de_mar_%28Pentremites_godoni%29%2C_Waterloo%2C_Illinois%2C_Estados_Unidos%2C_2021-01-18%2C_DD_081-136_FS.jpg/1920px-F%C3%B3sil_de_erizo_de_mar_%28Pentremites_godoni%29%2C_Waterloo%2C_Illinois%2C_Estados_Unidos%2C_2021-01-18%2C_DD_081-136_FS.jpg
- Who can see it: Teens profiles and older (museums give no ratings; placed by Invisible Network from the museum's own words)

Focused stacked image (55 frames) of a sea urchin fossil (Pentremites godoni), Waterloo, Illinois, USA. The diameter of the fossil is 4 centimetres (1.6 in) and it dates from the Serpukhovian period (Upper Mississipian), approximately 325 million years old.