Did Martian Meteorites Come From These Sources?

"Cosmochemists have determined that these rocks came from basaltic igneous sources with young (by planetary standards) crystallization ages no more than 1.3 billion years (with the one exception: ALH84001 with an age of 4.5 billion years) and were ejected from Mars by impact cratering events between 600,000 and 20 million years ago. While these rocks provide invaluable direct 'ground truth' that scientists are using to help piece together the chemical and geological history of Mars, the question remains where exactly did these rocks come from?"