Zircon (2) Rocks (2) Age (2) île (1) âge (1) comparaison (1) substance chimique (1) faille (1) Angleterre (1) États-Unis (1) Comparison (1) Composition (1) Assaying (1) Dating (1) Specimens (1) Origin (1) Volcanic ash, tuff, etc (1) Samples (Commerce) (1) Rye (1) Sedimentary rocks (1) Igneous rocks (1) Public domain (1) Orogeny (1) New England (1) Mass spectrometry (1) Land tenure (1) Islands (1) Intrusions (Geology) (1) Identity (Philosophical concept) (1) Granite (1)