This nodule is from the early Triassic of Madagascar and contains a very detailed fish known as Encrinesomus dixoni. Encrinesomus is thought to have been a still-water grazer on plants. Note the incredible detail preserved here, down to the rhombic scales and the finnage. Unlike most nodules, this one is a natural cast of the fish, displaying the left and right sides with remarkable fidelity. This is a fine example of a genus that went extinct during the upper Triassic.