Amino acid racemization data from land snails and whole-rock samples provides a geochronological framework for eolianite deposits on Lord Howe Island, ranging from the Holocene to the Middle Pleistocene. The dataset, from Geoscience Australia, defines three aminozones based on D/L ratios to correlate disparate stratigraphic successions. These data reveal eolianite deposition occurred over a longer time interval than previously known, linked to periods of high sea level.
Use Cases
- Correlating disparate stratigraphic successions based on amino acid racemization extents.
- Establishing a geochronological framework for eolianite deposits from Holocene to Middle Pleistocene.
- Linking large dune unit deposition to periods of relatively high sea level as indicated by the AAR data.
- Assessing the reliability of AAR dating by checking stratigraphic order and consistency across a suite of seven amino acids.
Strengths
- Data reliability is assessed by analyzing multiple samples from individual lithostratigraphic units.
- Defines three distinct aminozones (A, B, C) with specific mean D/L-leucine ratios provided.
- Findings are supported by independent lithostratigraphic interpretations and cross-validated with U/Th and TL ages.
Limitations
- Column-level documentation is absent; field semantics must be inferred after download.
- Row count is unknown, which may limit suitability assessment.
- Description metadata is limited; actual data quality requires manual inspection after download.
Provenance
- Source
- Geoscience Australia Data
- Collection Method
- Amino acid racemization (AAR) dating of eolianite and land snail (Placostylus bivaricosus) samples.
- Time Range
- Holocene to Middle Pleistocene
- Freshness
- Last updated 2026-04-30 13:15:46.005702; freshness should be verified.
- Geography
- Lord Howe Island, Southwest Pacific Ocean