Ku-ring-gai Chase National Park is a national park on the northern side of Sydney in New South Wales, Australia. The park is north of the Sydney central business district and generally comprises the land east of the M1 Pacific Motorway, south of the Hawkesbury River, west of Pittwater and north of Mona Vale Road. It includes Barrenjoey Headland on the eastern side of Pittwater.
Ku-ring-gai Chase is a popular tourist destination, known for its scenic setting on the Hawkesbury River and Pittwater, significant plant and animal communities, Aboriginal sites and European historic places. Picnic, boating, and fishing facilities can be found throughout the park. There are many walking tracks in Ku-ring-gai Chase. The villages of Cottage Point, Appletree Bay, Elvina Bay, Lovett Bay, Coasters Retreat, Great Mackerel Beach and Bobbin Head are located within the park boundaries.
The park was declared in 1894, and is the third oldest national park in Australia. The park is managed by the NSW National Parks & Wildlife Service and was added to the Australian National Heritage List in December 2006.
The park gets its name from the Guringai Aboriginal people who were long thought to be the traditional owners of the area. However, more contemporary research suggests that this was not the case.
Geology
Ku-ring-gai Chase is part of the Hornsby Plateau, a massive block of sandstone tilting upwards to the north. The park comprises a plateau with an elevation of generally 150–200 m above sea level. Between 250 and 200 million years ago, sand silt and mud was deposited by rivers across flood plains. These formed the shales, flagstones and sandstones of the Narrabeen Group that outcrop along the foreshores and ridges. Higher areas of the park are underlain with pink, white and orange layers of Hawkesbury Sandstone that contain small beds of shale. Wianamatta Group shale is present in the higher points of the park. The park's terraced landscape is due to the horizontal arrangement of these sediment layers.
Other rock types in the park are less common. Soils derived from the Narrabeen group of shales are around the eastern shore of the Lambert Peninsula, particularly around Elvina Bay and Lovett Bay. These richer soils provide for a vegetation type different from that of the sandy ridge top soils, providing for forests of spotted gums (Corymbia maculata) with forest oaks as a secondary layer. Eroded remnants of volcanic dykes occur including at Resolution Picnic Area at West Head and Campbells Crater near Cowan, which provide for forests of Sydney blue gum (Eucalyptus saligna).
More recent volcanic activity has forced small intrusions of igneous rock into the sandstone. A band of dolerite runs across the West Head peninsula near White Horse Beach, providing fertile soils for a distinct group of plants. The Smith's Creek area has intrusions of breccia.
The plateau is divided into separate sections by the steep valleys of Cowan Creek, Coal and Candle Creek, and Smiths Creek. These "flooded" or "drowned" valleys, knowns as rias, were eroded into the sandstone much deeper than the current sea level during the glacial phases of the Pleistocene ice age. When the ice caps melted about 10,000 years ago, the sea levels rose and flooded the valleys of the park, and separated Lion and Scotland islands from the mainland. The tributaries of Pittwater and Cowan Creek became bays and inlets along and extended shoreline.
The dominant rock type is Hawkesbury Sandstone which determines the topography and the vegetation in the sandy soils. Sandstone cliffs, rocky and outcrops, and worn caves are common throughout the park.
Indigenous people engraved the flat sandstone outcrops.
Tessellated pavements are found in the park whereby regular chequered patterns in the stone form along fault lines and lines of weakness.
The park's highest point is 246 m at Willunga Trig near West Head Road which runs along the ridge of the Lambert Peninsula.
History
Pre-European history
The name Ku-ring-gai (also spelled Kuringgai, Kuring-gai, Guringai, Kuriggai) () is an ethnonym referring to (a) an hypothesis regarding an aggregation of Indigenous Australian peoples occupying the territory between the southern borders of the Gamilaraay and the area around Sydney (b) perhaps an historical people with its own distinctive language, located in part of that territory, or (c) people of Aboriginal origin who identify themselves as descending from the original peoples denoted by (a) or (b) and who call themselves Guringai.