Viewing: Fossils & Stromatolites

Jul 6

July 6, 2014

Detail from Stromatolites in Shark Bay - Paul Harrison, 2005

Stromatolites – Part 2

I stated in my “Thrombolites” article in our September 2013 Newsletter (No. 405) that “I couldn’t recall having heard of thrombolites”. That was despite the fact that I had previously mentioned them in my 1999 Journal article titled “Stromatolites”. The second paragraph for the 6½-page article in Journal No.10, December 1999 stated, “spherical-shaped stromatolites are known as Oncolites and (mound-like) cyanobacterial limestone growing on submerged trees are known as Thrombolites”. The article went on to describe some thrombolites at Umm Said (on…

Posted in Fossils & Stromatolites | By

Sep 11

September 11, 2013

Thrombolites in Lake Clifton SeanMack 2008 CC_BY_3.0

Thrombolites & Stromatolites

Whilst watching a documentary on ABC TV, I saw what I thought were stromatolites, only to learn that they were called “thrombolites”. I couldn’t recall having heard of thrombolites. These ones were located at Lake Clifton in Western Australia. According to Wikipedia, “Thrombolites are clotted accretionary structures formed in shallow water by the trapping, binding, and cementation of sedimentary grains by biofilms of microorganisms, especially cyanobacteria (commonly known as blue-green algae).” It goes on to say that “Stromatolites are similar but consist…

Posted in Fossils & Stromatolites | By