I live near Lake Clifton in Western Australia, home of these rare round thrombolites (see photo). I have always wondered what the grey 鈥渞ocks鈥� in between the thrombolites are. The one in the centre of the photo has the appearance of a fracture face on a piece of shale. I clambered down to get one of them only to find they were soft and almost jelly-like in consistency. They were just about floating, bobbing with the water action, although some were submerged. Can someone identify them?
Willy Stobart, Dawesville, Western Australia
Advertisement
We pay 拢25 for every answer published in New Scientist. To answer this question 鈥� or ask a new one 鈥� visit newscientist.com/lastword. Terms and conditions apply.
This article appeared in print under the headline 鈥淏lob of the gaps鈥�