2007-03-12 04:06:22 · 4 answers · asked by Pepper171 2 in Science & Mathematics ➔ Earth Sciences & Geology
Blue green algae/cyanobacteria, which form characteristic layered mounds called stromatolites, are known as fossils in chert dating back to 3.5 billion years ago. They are also entirely awesome! they are known from Warrawoona, Australia and I believe there have also been reports of them in Archean cherts around the northern United States and Canada.
2007-03-12 11:33:04 · answer #1 · answered by kiddo 4 · 0⤊ 0⤋
In 1993, William Schopf identified fossilized microorganisms three and a half billion years old.
Do you mean, "known to people today"? Or, do you mean "fossils of man"? Your English is not clear to me. There is some argument about which fossils should be counted as being human.
2007-03-12 12:02:53 · answer #2 · answered by morningfoxnorth 6 · 2⤊ 0⤋
Graptolits, trilobites are some of the earliest known fossils to man.Apart from that some tiny mosses,sponges and lichens along with some algae are also known
2007-03-12 12:47:20 · answer #3 · answered by anusen1970 2 · 1⤊ 1⤋
In Africa!
2007-03-12 11:09:28 · answer #4 · answered by Anonymous · 0⤊ 1⤋