Keywords: 2012.09.14.121049 Supergroup stromatolite Yavapai Point Grand Canyon Arizona.jpg en Supergroup stromatolite exhibit at Trail of Time near Yavapai Point Grand Canyon Arizona USA 2012-09-14 12 10 49 own Hermann Luyken 36 058398 -112 127467 cc-zero Uploaded with UploadWizard Stratigraphy of Grand Canyon Stromatolites fossils |