The Glenville Hills Kames is a 345 hectare provincially-significant Earth Science Area of Natural and Scientific Interest

Area of Natural and Scientific Interest

An Area of Natural and Scientific Interest is an official designation by the provincial Government of Ontario in Canada applied to contiguous geographical regions within the province that have geological or ecological features which are significantly representative provincially or regionally...

 in Ontario

Ontario

Ontario is a province of Canada, located in east-central Canada. It is Canada's most populous province and second largest in total area. It is home to the nation's most populous city, Toronto, and the nation's capital, Ottawa....

, Canada

Canada

Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

.

Located in the northeastern part of the township of King

King, Ontario

King is a township in York Region north of Toronto, within the Greater Toronto Area in Ontario, Canada.The rolling hills of the Oak Ridges Moraine are the most prominent visible geographical feature of King. The Holland Marsh, considered to be Ontario's "vegetable basket", straddles King Township...

, it contains most of the eastern portion of Jokers Hill, site of the Koffler Scientific Reserve

Koffler Scientific Reserve

The Koffler Scientific Reserve at Jokers Hill, is a biological field station belonging to and managed by the University of Toronto. It occupies roughly 348 hectares of old fields, wetlands, grasslands, and forestlands in King Township, on the western portion of the Oak Ridges Moraine and close to...

 which conducts ecological research in the area. It consists of Late Wisconsinan deposits of Newmarket Till, from the Port Bruce Stadial

Stadial

A stadial is a period of lower temperatures during an interglacial separating the glacial periods of an ice age. Such periods are of insufficient duration or intensity to be considered glacial periods...

, and Kettleby Till, from the Port Huron Stadial. These are overlain by kame

Kame

A kame is a geological feature, an irregularly shaped hill or mound composed of sand, gravel and till that accumulates in a depression on a retreating glacier, and is then deposited on the land surface with further melting of the glacier...

s and kame slopes, which are the dominant topographical

Topography

Topography is the study of Earth's surface shape and features or those ofplanets, moons, and asteroids...

 features in the area, on the northern slopes of the Oak Ridges Moraine

Oak Ridges Moraine

The Oak Ridges Moraine is an ecologically important geological landform in the Mixedwood Plains of south-central Ontario, Canada. The moraine covers a geographic area of between Caledon and Rice Lake, near Peterborough...

. It is an "excellent representation of kame moraine features", which are uncommon in the region. It is in the East Holland River

East Holland River

The East Holland River is a river in Ontario, Canada that is part of the Holland River watershed that empties into Cook's Bay in Lake Simcoe. The headwaters of the East Holland River rise in the Oak Ridges Moraine...

subwatershed.

The site also demarcates the southermost advance of the Lake Simcoe sublobe during the Port Bruce Stadial, though most sediments were deposited by the Lake Ontario lobe.