This large rhyolite flake from is from Queensland, Australia.  The flake was initiated by wedging.  It likely dates to the Late Holocene.

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This rhyolite flake was detached from a river cobble through a wedging initiation, probably using a block-on-block technique where one river cobble was thrown down onto another.  Considerable force was necessary to create this large flake in such coarse stone.  Linear percussion features emanate from the platform, and the platform is a collapsed edge.  Additional unidirectional scars are present on the dorsal surface; these were initiated by the same blow that created this flake.  The flake is flat in profile at the proximal end, with no bulb of percussion, which is diagnostic of wedging initiations.  The stacked compression ring features at the distal end are also typical of wedging initiations.