New book out early 2023.

Early Cretaceous sediments reveal a story of prolonged cold climate, glaciations, oscillating sea level and tectonic changes is the latest bulletin to be published by the Geological Survey of South Australia.

It is the result of painstaking years of meticulously gathering information by the authors Neville Alley and Stephen Hore, providing rigorous, but objective, analysis.

The massive body of work provides explorers, researchers, academics and geoscientists with an opportunity to access a synthesis of new geological insights for the flanks of the northern Flinders Ranges. Its focus is on a relatively small region of the southern margin of the Eromanga Basin, a highly prospective and geologically complex region of the eastern Australian continent.

Detailed evidence of Early Cretaceous glaciations located in the Eromanga Basin region are presented – the only place on Earth where there is proven physical evidence of Early Cretaceous glacial ice. Evidence of the terrestrial extension of the glacial system pronounced in the Eromanga ‘Sea’ is also included.

Figure 1

Palynology, interpreted age and generalised sea-level curves, southern Eromanga Basin.

The complexity of the sediments of the Mesozoic and other aspects revealed along this margin reflects global sea level oscillations, emerging and receding fluvial systems, tectonic events and basin evolution. The result is a greatly improved understanding of climatic and tectonic changes and their impacts on landforms.

The bulletin’s conclusions are regionally, even globally, significant for understanding the paleoenvironment and paleoecology of the Mesozoic within the Southern Hemisphere, with implications for mineral and petroleum exploration and vital groundwater resources. It will provide a valuable reference on these regions for many years and will provide a firm base for any further research and industrial development, particularly in the Eromanga Basin region.

Published in 2 parts, volume 1 brings the investigations together and draws conclusions at a local, regional and global scale. Volume 2 is the repository of data and an explanation of the methods used.

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More information about Bulletin 57

– Stephen Hore, December 2022

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