| The early diagenetic precipitation of hematite and calcite took place during subaerial exposure and are the results of caliche and palaeosol formation. |
| All these fossils are stratigraphically below the Siesta palaeosol in a glacial sequence deposited on the lower Oliver Platform. |
| The red mudstone horizons preserve extensive pedogenic textures and desiccation cracks indicative of mature palaeosol development. |
| A Pliocene age for the Siesta palaeosol and Nothofagus fossils has been inferred from diatom and palynological biostratigraphy. |
| Palaeosol horizons are interbedded with these units, representing the pedogenic alteration of exposed floodplain sediments. |
| Thin coals mark periods of swamp conditions on the floodplain, although some palaeosol profiles suggest relatively well-drained conditions, including a thin calcrete. |
