Cretaceous Sequence in Giralia Anticline: Late Hauterivian-Barremian Outcrop and Well Data

Outcrop and well data from the oldest Cretaceous sequence in the Giralia Anticline, Western Australia, are described and biostratigraphically assessed. The Australian Ocean Data Network provides this geological study, last updated on 2026-06 04. The description details a 10-meter thick basal sand unit overlain by 56 meters of carbonaceous siltstone-mudstone.

Use Cases

• Modeling transgressive and highstand systems tracts based on described sediment sequences.
• Analyzing paleoclimate indicators based on growth-ring analysis of fossil conifer wood.
• Studying marine biofacies changes based on palynomorph and foraminiferal assemblages.
• Correlating regional sea-level rise events based on the described late Hauterivian-Barremian transgressive pulse.

Strengths

• Provides detailed stratigraphic measurements, including a 10 m thick basal unit and 56 m thick overlying shale.
• Includes biostratigraphic age assessment (Muderongia australis Zone) for specific intervals.
• Describes multiple fossil types, including conifer wood, ichthyosauran bones, and ammonites.

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 10 m thick sandstone unit is described as uncertain.

Provenance

Source

Australian Ocean Data Network

Collection Method

Outcrop description and biostratigraphic assessment of a well.

Time Range

Late Hauterivian-Barremian (Early Cretaceous)

Freshness

Last updated 2026-06-04 07:04:15.178745; freshness should be verified

Geography

Giralia Anticline, Carnarvon Basin, Western Australia