Figure 2
From: Accumulation of radiocarbon in ancient landscapes: A small but significant input of unknown origin
Paleosol outcrops examined in this work. (A), Oligocene (28 Ma) lower Turtle Cove Member of the John Day Formation (44.670229, − 119.627418); (B) and (C), Allophane/imogolite-rich Andisol paleosols buried by overlying ignimbrite (horizontal tan and brown layers); (D) Early Oligocene (33 Ma) middle Big Basin Member of the John Day Formation (44.628605, − 120.212263); (E) and (F), Al and Fe-smectite-rich Alfisol paleosol (“Luca” pedotype from9) buried by volcanic tuff (sharp white layer); G) Early Oligocene (33 Ma) middle Big Basin Member of the John Day Formation (44.638333, − 120.220021); (H) and (I), Al/Fe smectite and Mn-oxide-bearing Inceptisol paleosol (“Lakim” pedotype from9) buried by gleyed biotite-bearing tuff (green layer).
