The only event the Time Almanac has listed under 4.5 billion B.C. is this "formed"
[DOC] [TLE] A talk.origins Age of the Earth Debate - The Talk.Origins Archive [PAR] Feb 27, 1992 ... Radiactive carbon-14 is formed in the atmosphere through the action of ... 4.5 
billion years would have produced 150 times as much sediment at the present 
rate.