How old is the Sydney Sandstone?

Question

BlackTom AI · Accepted Answer

First, let’s restate the question and options to set the stage for analysis.
Question: How old is the Sydney Sandstone?
Answer options: ["300-250Ma", "2Ma", "250-200Ma", "100-150Ma"]

Option 1: 300-250Ma. This range corresponds to the late Paleozoic to early Mesozoic boundary, roughly around the Permian to early Triassic. However, the Sydney Basin deposits, including the Sydney Sandstone, are generally associated with the Triassic period, not extending squarely into the late Permian. This makes this option an inaccurate fit for the commonly cited age.

Option 2: 2Ma. The abbreviation Ma stands for million years ago, which places this at the Pleistocene, a time much more recent than the formation of the Sydney Sandstone. Since the sandstone is widely regarded as much older, this choice contradicts established geological timing and is clearly incorrect.

Option 3: 250-200Ma. This interval spans from the late Triassic to the early Jurassic, a period that aligns well with the known age of the Sydney Sandstone, which is commonly described as Triassic in age. This range sits squarely within the expected time frame for the formation and is consistent with regional stratigraphy.

Option 4: 100-150Ma. This window falls in the early to mid-Cretaceous, which is substantially later than the Triassic age attributed to the Sydney Sandstone. Therefore, this option mismatches the widely accepted geologic age of the unit.

Now, comparing the options as a whole, the incorrect choices place the sandstone in Permian-early Triassic (Option 1), Pleistocene (Option 2), or mid-Cretaceous (Option 4), none of which match the established Triassic age range for the Sydney Sandstone. The only option that aligns with the recognized Triassic age (late Triassic to early Jurassic) is Option 3, 250-200Ma. This makes Option 3 the most consistent with the geologic evidence for the formation.

In summary, the reasoning revolves around matching the Sydney Sandstone to its accepted Triassic age, while recognizing how the other ranges conflict with that timeline and with standard stratigraphic correlations.

OLES1600 (ND) Week 4 | Lecture Quiz

How old is the Sydney Sandstone?

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