Noun
the part of a continent that is stable and forms the central mass of the continent; typically Precambrian
Source: WordNetLaurentia is an ancient craton which forms the geologic core of North America; it formed between 1.5 and 1.0 billion years ago during the Proterozoic eon. citation The Canadian Shield is the largest exposure of this craton. Source: Internet
In a portion of the Pilbra Craton in Western Australia, one of the oldest pieces of the Earth’s crust, scientists found a latitudinal drift of about 2.5 centimetres a year and dated the motion to 3.2 billion years ago. Source: Internet
The Canadian Shield is U-shaped and is a subsection of the Laurentia craton signifying the area of greatest glacial impact (scraping down to bare rock) creating the thin soils. Source: Internet
The North American craton is the bedrock forming the heart of the North American continent and the Canadian Shield is the largest exposed part of the craton's bedrock. Source: Internet
Promoted to the rank of Professor are Dr. Lisa Brodhacker, of the Department of Physical Sciences; Dr. Lillian Craton, of the Department of English and Foreign Languages; and Dr. Lee Vartanian, of the Department of Teacher Education. Source: Internet