Cretaceous Sequence in Giralia Anticline: Late Hauterivian-Barremian Stratigraphy

Outcrop and well data describe a 66-meter thick Cretaceous sequence in the Giralia Anticline, Western Australia. The sequence includes a 10-meter basal Birdrong Sandstone overlain by 56 meters of Muderong Shale, assessed using biostratigraphy. The data, published by Geoscience Australia, includes analysis of fossil wood, ichthyosaur bones, and palynomorphs to interpret depositional environments.

Use Cases

• Modeling transgressive systems tracts based on described sediment composition and biofacies changes.
• Analyzing paleoclimate signals based on growth-ring analysis of fossil conifer wood.
• Correlating regional sea-level rise events based on the late Hauterivian-Barremian sequence described.
• Studying fossil assemblages, including ichthyosauran bones and ammonites, for paleoecological reconstruction.

Strengths

• Detailed biostratigraphic assessment of a defined 66-meter geological sequence.
• Analysis includes specific fossil evidence like conifer wood with Teredolites borings and ichthyosauran bones.
• Interpretation of depositional water depths (less than 50 meters) and climate (seasonal humid mesothermal).

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• The age of the upper Muderong Shale and a sandstone unit is noted as uncertain.

Provenance

Source

Geoscience Australia Data

Collection Method

Outcrop description and analysis of the Giralia No. 1 well core.

Time Range

Late Hauterivian-Barremian (Early Cretaceous)

Freshness

Last updated 2026-04-30 14:27:56.274945; freshness should be verified.

Geography

Giralia Anticline, Carnarvon Basin, Western Australia