Geomorphology Of The Gigantic Murray Submarine Canyons

Australian Southern Margin features a group of deeply-incised submarine canyons, including some of the largest on Earth, descending to 5200 meters deep. The dataset describes their dimensions, gradients, geological controls, and episodic formation history since the Cretaceous. It was published by the Australian Ocean Data Network and last updated in April 2026.

Use Cases

• Analyze canyon dimensions like length (80 km), depth (5200 m), and wall height (2 km) to classify submarine canyon scale and morphology.
• Study thalweg profile gradients (15-30 degrees upper slope, 4 degrees mid slope) and wall slopes (15-22 degrees) to model erosion processes and sediment transport.
• Correlate canyon down-cutting events (early Paleocene, Oligocene, Miocene-Pleistocene) with major unconformities in adjacent basins for regional geological history.
• Investigate the role of WNW-trending Jurassic-Cretaceous rift structures in controlling the irregular shape of the central canyons.
• Model the formation of large holes (up to hundreds of meters deep, spaced 5 km apart) along outlet channels as evidence of turbidity currents from slope failures.

Strengths

• Describes some of the largest submarine canyons on Earth, with specific dimensions like 80 km length and 5200 m depth.
• Provides detailed geomorphic metrics including slope gradients (15-30 degrees), wall angles (15-22 degrees), and continental margin width (65 km).
• Offers a long-term evolutionary perspective with episodic down-cutting events dated from the latest Cretaceous to the Pleistocene.

Limitations

• Specific row count, column structure, and sample data are unavailable, limiting direct analytical use.
• The data appears to be a descriptive publication rather than a structured, machine-readable dataset.
• Geographic scope is limited to a 400-km section of the Australian Southern Margin near Kangaroo Island.

Provenance

Source

Australian Ocean Data Network.

Collection Method

Scientific analysis and synthesis, likely from marine survey data and published research.

Time Range

Covers geological formation from the latest Cretaceous to the Pleistocene, with peak activity since the Oligocene.

Freshness

Last updated in April 2026.

Geography

Murray Canyons on the continental slope off Kangaroo Island, South Australia, spanning a 400-km section.