Mushroom shaped stromatolites

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Mushroom shaped stromatolites


This is a transcript of a QuickTime movie (1.8 MB) recorded at Shark Bay in 2005. Adrian Brown and Stefan Leuko, from the Australian Centre for Astrobiology, discuss the reason for the mushroom shapes of the stromatolites.

Transcript:

Why are they mushroom shaped?

Maybe because just of the sedimentation as it happens that sediment material just laying over top over there, and just forming over with the time, over 1000 years. Just sediment down, build another layer and another layer comes and dies and another layer comes over and dies there again. So that's why the closer they come to the surface the more they spread. To get more light, to get more sea water to get more surface, it was washed with sea water to get more of nutrients and what they need to live.


Contents


Introduction

Context

Early Life

Evidence

Acknowledgements

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