Where can I get geological maps?

Geologic maps at many scales and from many sources are listed in the National Geologic Map Database. Some geologic maps can be purchased in hard copy through the USGS Store. Download digital geologic maps for entire states from the USGS Mineral Resources Online Geospatial Data (MRDATA) website.

When was the east coast of Australia mapped?

In 1770, James Cook sailed along and mapped the east coast, which he named New South Wales and claimed for Great Britain.

How many cratons are there in Australia?

There are three main cratonic shields of recognised Archaean age within the Australian landmass: The Yilgarn, the Pilbara and the Gawler cratons. Several other Archaean-Proterozoic orogenic belts exist, usually sandwiched around the edges of these major cratonic shields.

Is Australia a Craton?

The North Australian Craton (NAC) – matching roughly to the Northern Territory, the Kimberley and northern Queensland – was likely linked to parts of what is now northern China. The West Australian Craton (WAC) was made up of both the Yilgarn and Pilbara cratons that had collided together earlier.

What map is best for showing detailed geologic information about an area?

Topographic maps are important in geology because they portray the surface of the earth in detail. This view of the surface shows patterns that provide information about the geology beneath the surface.

How do you cite a geologic map?

This citation is in common use today: Doe, J.K., and Smith, A.B., 1999, Geologic map of the XYZ Quadrangle: The Geological Survey, Map X-123, scale 1:24,000.

Where did the Dutch land in Australia?

While Indigenous Australians have inhabited the continent for tens of thousands of years, and traded with nearby islanders, the first documented landing on Australia by a European was in 1606. The Dutch explorer Willem Janszoon landed on the western side of Cape York Peninsula and charted about 300 km of coastline.

Where did the Portuguese land in Australia?

The book “Beyond Capricorn” says the map, which accurately marks geographical sites along Australia’s east coast in Portuguese, proves that Portuguese seafarer Christopher de Mendonca lead a fleet of four ships into Botany Bay in 1522 — almost 250 years before Britain’s Captain James Cook.

What is the oldest part of Australia?

In recent years, science has confirmed what Aboriginal Australians, the world’s oldest continuous living culture, always knew: the Pilbara region of Western Australia is among the oldest places on Earth.

Is Australia the oldest continent in the world?

Earth’s oldest known piece of continental crust dates to the era of the moon’s formation. Australia holds the oldest continental crust on Earth, researchers have confirmed, hills some 4.4 billion years old.

What is the difference between topographic and geologic maps?

Elevations indicate height above sea level. Contour lines are lines of equal elevation. Contour intervals are the difference in elevation between two contour lines. Geologic maps show rock units and geologic features, like faults and folds.

How do you read a geologic map?

The letter symbols signify the name and age of the rock units in an area. The first letter refers to the geologic age, as shown above. The other letters refer to the formation name or the rock type. The geologic map of Rhode Island is a good example of how the symbols are used.