| Ammonoids from the Meekoceras beds, Lower Triassic Union Wash Formation, Union Wash, California. Meekoceras mushbachanum White. Specimen at top is 22mm in diatmeter; middle ammonite is 28mm in diameter; and cephalopod at bottom is 30mm is diameter. |
| Ammonoids from the Meekoceras beds, Lower Triassic Union Wash Formation, Union Wash, California. Meekoceras mushbachanum White. Specimen at top is 22mm in diatmeter; middle ammonite is 28mm in diameter; and cephalopod at bottom is 30mm is diameter. |