1. http://www.psrd.hawaii.edu/May10/YoungerALH84001.html Younger Age for Oldest Martian MeteoriteYounger Age for Oldest Martian Meteorite Long Geologic History Formation by crystal accumulation in a magma chamber Shocked and crushed by impact Aqueous alteration and deposition of carbonate globules Isotopic systems, hence ages, affected by shock and alteration

2. http://www.psrd.hawaii.edu/May10/YoungerALH84001.html Younger Age for Oldest Martian MeteoriteYounger Age for Oldest Martian Meteorite Igneous formation age of ALH84001 is 4.09 Ga, much younger than the previously-reported Sm-Nd age of 4.50 Ga.

3. http://www.psrd.hawaii.edu/May10/YoungerALH84001.html Younger Age for Oldest Martian MeteoriteYounger Age for Oldest Martian Meteorite Next step: Reconcile igneous, impact, and alteration events recorded in ALH84001 with ages of impact basins on Mars. Frey (2010)