https://en.m.wikipedia.org/wiki/Thrombolite
Thrombolites can be distinguished from microbialites or stromatolites by their massive size, which is characterized by macroscopic clotted fabric. Stromatolites are similar but consist of layered accretions. Thrombolites appear with random patterns that can be seen by the naked eye, while stromatolites has the texture of built-up layers.[2]
Stromatolites? Yeah, relics of the first life on earth. Or are thrombolites different from stromatolites? Never heard of thrombolites.
https://en.m.wikipedia.org/wiki/Thrombolite
Thrombolites can be distinguished from microbialites or stromatolites by their massive size, which is characterized by macroscopic clotted fabric. Stromatolites are similar but consist of layered accretions. Thrombolites appear with random patterns that can be seen by the naked eye, while stromatolites has the texture of built-up layers.[2]
TIL