Summary: A single engraved circle and three sets of axe grinding grooves in a small rock platform in Hidden Valley.

A small rock platform above Hidden Valley has a single circular engraving in the sandstone, and a few groups of axe grinding grooves.

AWAT6417 LR Hidden Valley Grinding Grooves

The stone circle may indicate that this was a sacred area. It is fairly deeply carved.

AWAT6439 LR Hidden Valley Grinding Grooves

There are at least three sets of shallow axe grinding grooves.

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Aboriginal Sites by National Park

Yengo National Park was an important spiritual and cultural place for the Darkinjung and Wonnarua People for thousands of years, and 640 Aboriginal cultural sites are recorded in the park and nearby areas.
Located to the north-west of Sydney, just south of the Dharug and Yengo National Parks, Maroota has a high concentration of (known) Aboriginal sites. Many more Aboriginal heritage sites are located in the Marramarra National Park. The original inhabitants of the area were the Darug people.
Over 40 sites have been recorded within the park; many were located along the river bank and were flooded by the building of the weir in 1938.