http://www.aaa3.net/how-to-scale-measurements/

August 2010 Geology and GSA Today highlights
( Geological Society of America ) Digging dinosaurs, burrowing worms, weakened rocks, immobilized uranium, slowstanding sea levels, isolated nunataks, colliding sediments, retreating ice sheets, westerly winds, electrically conductive lithosphere, dynamic debris flows, reactivated landslides, rock incompetence, recrystallized quartz, and biased sedimentation are some of the topics presented in …
Scale and Indirect Measurement