Summary: An Aboriginal axe grinding groove site in the bed of Bumbles Creek, where its forded by Kilkenny Road. It's estimated there are more than 500 grooves.

In the bed of Bumbles Creek is the largest collection of axe grinding grooves on the Central Coast – and possibly the Sydney-Hawkesbury region. It’s estimated that there are over 500 grinding grooves at the Kilkenny Road Grinding Groove site: Ian Sim noted 200 in the 1960s, a NPWS study in 1996 suggested 150+ grooves and Bob Pankhurst counted 322, with many more likely to be buried under silt.

The many grinding grooves are both under water and on both sides of the creek.

A number of engravings have also been recorded here, which include a circle, multiple mundoes and a human figure.

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Aboriginal Sites by National Park

Red Hands Cave, Glenbrook (Blue Mountains)
The Blue Mountains National Park (and surrounding areas along the Great Western Highway) is thought to have over a thousand indigenous heritage sites, although much of the park has not been comprehensively surveyed. The Aboriginal rock sites in the Blue Mountains include grinding grooves, stensils, drawing and rock carvings.
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.
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.
Hornsby Shire - which is the largest LGA in the Greater Sydney Metropolitan region - contains approximately 600 recorded Aboriginal rock art sites (and over 1,200 Aboriginal heritage sites). These date back from thousands of years to post-European contact art.