This metasedimentary bidirectional core is from the Northern Tablelands of New South Wales. The core was reduced from platforms located at either end of the stone. The Anaiwan People rescued the artefact from development then returned the artefact back to country after the 3D model was made.
This relatively large core was made from a tabular piece of unusually high-quality metamorphosed sedimentary rock. These rocks were formed where intruding granite baked layers of sedimentary stone, silicifying them. The stoneworker reduced the stone down the long axis to maximise the length of the flakes struck from it. Carefully-prepared platforms were established at either end of the stone, and reduction occurred in both directions, or ‘bidirectionally’.
See the annotations for technological details about this stone tool.
The bidirectional method of stone reduction is common in some parts of the world—Naviform cores are an example from Western Asia—but bidirectional cores are uncommon in Australia. The method is an excellent way of maintaining a long core face because a mistake such as a hinge or step termination can be removed by striking under it from the opposite platform.