original_query: What is the earliest evidence for life on Earth?
query: What is the earliest evidence for life on Earth?
answer: The earliest evidence includes biogenic graphite found in 3.7 billion-year-old rocks from Western Greenland and microbial mat fossils in 3.48 billion-year-old sandstone from Western Australia.  More recently, remains of biotic life were found in 4.1 billion-year-old rocks (2015), and in 2017,  putative fossilized microorganisms were discovered in 4.28 billion-year-old rocks in Quebec, Canada.