# Guelph Formation stromatolite

- By: Óðinn
- Date: 2015-11-14
- Classification: Photograph
- Museum: [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Guelph_Formation_stromatolite.jpg)
- Rights: [CC BY-SA 2.5 ca](https://creativecommons.org/licenses/by-sa/2.5/ca/deed.en)
- Picture: https://invisiblenetwork.ai/thumbs/commons/thumb/3/36/Guelph_Formation_stromatolite.jpg/1920px-Guelph_Formation_stromatolite.jpg
- Who can see it: Kids profiles and older (museums give no ratings; placed by Invisible Network from the museum's own words)

A stromatolite, preserved in dolostone of the Guelph Formation. Diameter is ~0.75 m.