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Slide 1 I recently started reading up on stromatolites after I learnt that we have stromatolite formations and living tufa cyanobacteria colonies in the rocky beaches of Port Elizabeth, South Africa. The cyanobacteria found here are unique, their habitat is the semi-freshwater pools where freshwater from springs meet the sea where they line and grow on the submerged surfaces of the pools. The stromatolites have irregular forms and my observation is that quite often they are concave plates opposed to the more well known dome shaped forms. Here is a photo I took at Schoenmakerskop this morning. The cyanobacteria colony is in the centre and the stromatolite formations in the background Picture 1 I was wondering how it is that the reefs are often arranged in straight and parallel lines, some drama must have played off here over millions of years! Here is an example of the convex shaped plates (How old are they?) Picture 2
