I don't think stromatolites are important to understand the origin of
life on Earth. They are yet some kind of advanced cells, so they appeared
time after the primogenic cell, and more time after the first
autoreplicatives molecules.
About what stromatolites are: maybe a geologist could explain it to you
better, 'cause they are not alive individuals, they are (as the same word
say) fossil entities produced by the biological activity of great colonies.
No more. See you! * Albano *
