A sample from the 15015 breccia has been searched for impact microcraters. The size-frequency distribution of craters is typical of a surface in production state. Comparison with laboratory produced craters implies they have been made by roughly 3-g/cu cm density projectiles at impact velocity in the 10-15 km/sec range. This velocity is in agreement with recent data from satellite detectors. The low solar-flare track density and the number density of microcraters are consistent with an exposure time of the sample to the meteoritic bombardment of 3000 yr.
Lunar and Planetary Science Conference Proceedings
- Pub Date:
- Lunar Craters;
- Lunar Rocks;
- Meteoritic Damage;
- Particle Size Distribution;
- Lunar and Planetary Exploration