JGJohn Grant0000-0001-8276-1281FollowUsage metrics Co-workers & collaboratorsSPSharon PurdyResearch GeologistSharon PurdyAMAlex MorganAlex MorganNWNicholas WarnerNicholas WarnerCWCatherine WeitzCatherine WeitzADAlan D. HowardAlan D. HowardMGMatthew GolombekMatthew Golombek