The document discusses parna deposits in the Yass Valley of New South Wales. Key points: - Parna deposits in the area have properties comparable to deposits further west and impart favorable properties for agriculture, particularly wine grape production. - Seven study sites were analyzed to characterize the morphology, distribution, and properties of the parna soils. Analytical tests showed the parna has stronger structure and fewer dispersive particles than underlying clay layers. - The parna soils satisfy criteria for classification as high quality agricultural land due to their structural stability, available water capacity, and suitability for crops and pastures. However, current land mapping may underestimate the agricultural value of areas with parna soils.