Cross-Section of Utah Septarian Nodule, Utah. A type of geode, Utah Septarian Nodules are found about 15 miles east of Zion National park. They were formed in an ancient sea floor during the Cretaceous period, 50-70 million years ago.
Leesburg conglomerate, or more precisely, Leesburg Conglomerate Member of the Bull Run Formation described as gray carbonate pebble conglomerate in a red sand-silt matrix. The pebbles are predominantly dolomite in the north and limestone in the south