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The oldest rocks on Earth can be very difficult to find and verify, but the youngest rocks are easy to locate: look for the nearest active volcano. The oldest whole rocks found so far date back about 4.28 billion years. They were found in 2001 by geologists excavating near Canada's Hudson Bay in northern Quebec, andthe research appeared in the ...
A piece of Canada that broke off about 1.7 billion years ago has been found in Australia. Geologists analyzed chemical signatures for very ancient sedimentary rocks in Georgetown, Queensland, that offer clues about where those rocks were when they formed. At that time, the continents were drifting
In geology, pictures of rocks can be used to help you best determine which of the three major types a particular rock belongs to: igneous, sedimentary, or metamorphic. By comparing your rock sample with photographic examples, you can identify key characteristics such as how the rock was formed, what
Dolostone is a common sedimentary rock which can be found in massive beds several hundred feet thick. Disputes have arisen as to how these dolomite beds form as at present time, dolomite does not form on the surface of the Earth, yet massive layers can be found in ancient rocks.
POROSITY AND BULK DENSITY OF SEDIMENTARY ROCKS By G. EDWARD MANGER ABSTRACT More than 900 items of porosity and bulk density data for sedimentary rocks have been tabulated. Most of the data are from the more accessible American, British, German, and Swiss literature. The number of porosity
Metamorphic rocks are most often found in mountainous regions though they can be seen wherever there are signs of geological upheaval in an area. This type of rock is formed by the transformation of another rock type, a change that is usually triggered by tremendous heat, pressure or other violent