The geological cross section for Goondiwindi (300 km west of Brisbane) extends from west to east and is typical of the sort of information provided. I’ve included only about 75% the width of the section. The vertical scale on the section is exaggerated. If it was shown in proportion it would be too narrow to see the detail. In the image here I’ve squashed the section even narrower to fit better on your browser. The vertical exaggeration is 8 times.
The need for this vertical exaggeration illustrates the first feature of the sedimentary layers shown on the map. The layers are relatively thin compared with their lateral extent, a feature that Derek Ager, in his book “The Nature of the Stratigraphical Record”, described as characteristic of sedimentary strata all over the world. These layers extend for nearly 2,000 km to the west into the Northern Territory and South Australia (see map here). Such a wide lateral extent of strata is not a prediction from geological uniformitarianism but it is a prediction for sediments laid down during Noah’s Flood: “It is expected that the structures formed during the Inundatory stage would be of continental scale” (see Geological Environments).
Although the sedimentary layers dip down to the west on the exaggerated diagram, they are in fact almost horizontal in the field. Note they sit on a basement that is intensely deformed. In other words, there is a clear geological demarcation between the sedimentary strata and the underlying basement. Notice the total thickness of all the sedimentary layers is more than 2 km at the western side of the section. On the map the layers are labelled with letters indicating their names: e.g. the symbol Jlh stands for Jurassic, lower, Hutton sandstone. The first letter refers to the geological system: C means Carboniferous, P = Permian, R = Triassic (actually it is a T and an R joined together), J = Jurassic and K = Cretaceous.
I concluded that these strata were deposited during first part of Noah’s Flood as the waters were rising but toward the time when they were reaching their peak (see my classification of the Great Artesian Basin). The flow of water spread the sediment over vast geographical areas. Certain strata in these layers contain footprints of dinosaurs (temporarily stranded as they tried to escape), which means the layers were deposited before the waters had reached their peak and all air-breathing animal life had perished (Genesis 7:20–24).
Initially I wondered if the deformed basement beneath the strata had been deposited during Creation week. However, these strata contain fossils, which is why they have been classified as Carboniferous and labelled with a C. It’s because of this I concluded that they were earlier Flood deposits. The deformation was a consequence of the tectonic activity during the first part of that event.
Look across the horizontal land surface and you can see that the blue strata are sloping upwards to the east and that they have been truncated, or shaved off, at the surface. That is a feature that is predicted from the global Flood (see “Flat topped landforms” under Classification Criteria). The land surface was eroded as the floodwaters flowed in vast sheets back into the ocean.
This geological cross section for Goondiwindi reveals a clear sequence of geological processes that are easily linked to the sequence of events that occurred during Noah’s Flood. This is a preliminary overview, of course, and the ideas need to be checked and tested with ongoing research. But it illustrates how that, from this section, it is easy to develop a geological history of the area using a biblical perspective.