Ninmaroo Formation Lithofacies and Depositional Sequences

Geoscience Australia data details the epeiric carbonate sedimentation of the Upper Cambrian-Lower Ordovician Ninmaroo Formation in the Georgina Basin. The dataset describes lithofacies including ooid, peloid, flat-pebble conglomerate, skeletal, and crystalline dolostone units, alongside their depositional environments. It models two regressive sequences from a prograding barrier complex to subsequent offlap driven by tidal circulation.

Use Cases

• Model lithofacies distribution (ooid, peloid, skeletal) to reconstruct the paleogeography of the epicontinental sea.
• Analyze the cyclic sedimentation patterns to infer storm-driven shoaling frequencies in the carbonate sequence.
• Map the transition from normal marine to evaporitic conditions using described salinity and facies changes.
• Correlate the two regressive depositional sequences with shelf stability and slope changes indicated in the data.

Strengths

• Data originates from the authoritative Geoscience Australia organization.
• Provides detailed descriptions of multiple carbonate and terrigenous lithofacies.
• Covers a specific geologic time interval (Upper Cambrian-Lower Ordovician).

Limitations

• No structured tabular data (columns, rows) is provided; information is in narrative HTML/PDF formats.
• Sample data is unavailable, limiting immediate analytical use.
• The dataset's size and row count are unknown.

Provenance

Source

Geoscience Australia Data

Collection Method

null

Time Range

Upper Cambrian-Lower Ordovician

Freshness

null

Geography

Georgina Basin (Northern Territory and Queensland, Australia)