The magnetic-anomaly- and gravity anomaly- map and geological maps indicate a very old  50 km Impact Crater in the Pilbara Craton near Marble Bar / Western Australia. This impact crater (structure) was formed either by a large asteroid or comet (-fragment) which impacted in the Pilbara Craton ( Western Australia) approx 3 -3.5 billion years (Ga) ago. The impact structure, which probably is connected to the Barberton Greenstone Belt (BGB) Impact Event which happened 3.26 - 3.24 Ga ago in South-Africa, may be responsible for the development of some of the first life-forms on Earth approximately 3.25 Ga ago ! The Geologist Andrew Y. Glikson pointed out, that there seems to be a clear correlation between the Barberton Greenstone Belt (BGB) Impact event 3.26 – 3.24 Ga ago in South-Africa and stratigraphic units of the same age in the Pilbara Craton in West-Australia. I have used Micro-Raman spectroscopy on quartz samples which I collected north of the assumed Pilbara Crater, and I found first proof for an impact shock event as the probable cause of the described impact structure (see weblink). Both impact events, the Impact Event in the Pilbara Craton / West-Australia and the BGB Impact Event in the Kaapvaal Craton in South-Africa probably happened at the same time ! It is possible that both impact events were caused by the same impactor, probably a large carbon-rich Comet. This comet probably collapsed just before the impact, and its fragments then formed the BGB impact structure and the Ø 50 km Pilbara Impact Crater structure described in this study, which later led to the Strelley Pool Chert (stromatolite carbonate platform). The development of the oldest known Stromatolites, that were found close to the two impact sites, in all probability was a longterm result of these two impacts and the organic- material which arrived together with the impactor ( comet ) fragments ! Water which ascended from Earth’s mantle after the impact may have contributed to life development. There are only around 20 documented varieties of stromatolites for the period 2.8 - 3.25 billion years ago. The oldest 3.25 Ga Stromatolites are found in the Hooggenoeg Formation ( Buck Ridge ) / South Africa near the BGB Impact Structure and in the Dresser Formation / West Australia, less than 30 km away from each of the two impact sites !